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I feel bad for you but Im so jealous. I am just curious how often are you doing water changes I usually read and hear something like 10-20÷ a week is fine. As for your algea issue I'm pretty sure chemiclean would do the trick in the short run, definitely not a long term solution. I'm interested to read responses to me mentioning chemiclean as I don't know how all your fish would take it
You can measure the tank sizes and find a tank volume calculator online to get some pretty accurate numbers. Personally I would just call it HUGE
I've been feeding less to try to keep the nutrients from going too crazy. I'm at about 3-4 times a week right now.I would avoid chemiclean without knowing your skimmer more.
This treatment reduces O2 and also as soon as the treatment is done the algae will have the same conditions that allowed it to thrive. There is decaying material in your sand and not enough flow. Short of removing the sand from the dt some ideas that are not super expensive, other than powerhead replacement and cost of salt.
-up the flow, get a new set of powerheads to replace the dead one.
-reduce lighting intensity in the display.
-gravel vac vigorously while doing water changes.
-feed less, @dsc reef reef should be able to help here with how much sharks need a day.
-and @Paul B has a skimmer similar to yours should be able to help you tune it.
-and media bags of purigen and phosgaurd could also help get your nitrates and phosphates back in line.
TBH I think its largely they were used to being fed more. The previous owners seemed to mostly feed squid rings for the larger fish, which I've had described to me as "popcorn for fish" by a zoo aquarist. We've been trying to provide a more rounded diet, but the nutrient levels have led me to feed less often. They're mostly pretty chill except when they think food is coming. I've also been told by the same folks that the central "island" of rocks is really bad for them as it encourages lap swimming, which isn't really the kind of behaviors they should be exhibiting. I'm hoping a rework of the aquascaping will maybe help destress them a bit along with getting a little more frequent but smaller feedings once I have the nutrient levels sorted.I am not going to tell you what to do with your tank and your fish. If it was mine, I would start talking to public aquariums about finding a new home for the sharks. They seems pretty cramped in the tank, especially if they are destroying the rock scape.
Ask yourself if these are the livestock you want to keep. The success of this tank is going to boil down to your passion to keep it going. If you're keeping fish because they came with the tank, that has the potential to dim that passion. However, if you're keeping your dream fish and working towards a goal (like some anthia harem, clusters of anemones and clownfish, schooling chromis, several tangs racing across the tank) you are more likely to succeed.
You can go lights out for a few days to combat the cyano. It's going to break down and dissolve temporarily. This gives you a chance to export more of it via water changes and can give your macro algae in the fuge a fighting chance.
Check out this led for your fuge. Low power and a good spectrum. I only have a 20g fuge on a 200g system and I throw away half a gallon of algae a week. It says 200w but the two 100w pucks are only driven at 50%.
https://www.amazon.com/dp/B0776R69WH?ref=ppx_pop_mob_ap_share
Your "undergravel" crushed coral bed is likely packed with detritus that breaking down and doing more harm than good. Taking that rock out, putting it in bins of clean saltwater while you clean out any remaining detritus in the chamber will help. You can put it all back in and keep using it. The surface area is great for processing ammonia and nitrites but fish poop and uneaten food are going to keep getting trapped in there and require cleaning occasionally.
water quality. . .. tell us about your filtration. What type?
Ok, gonna try to summarize and hopefully hit on some other points since a lot came through overnight:
Seems general consensus right now is ditch the undergravel setup or at the very least pull everything and start fresh.
I now it's been clogged before and it's a real chore to clean out, mostly because its big and since it's on the floor, I'm either using a powered setup or dumping the water every few minutes because my head has equalized. Powered, I've been trying to run it through a filter pad so I'm not just draining the tank cleaning a corner of the undergravel.
I'll likely look to ditch it in favor of something more efficient and maybe see about using a super high surface area porous media to offset the lost bio filter. Maybe something like these and sub out some of the bio balls in the sump inlet area:
https://www.saltwateraquarium.com/xport-bio-1-2-cubes-biological-filtration-media-500-ml-brightwell/
https://www.saltwateraquarium.com/nano-tech-bio-spheres-1kg-2-2lbs-maxspect/
I'm wide open to recommendations here
As for what to do with the area the filter is in, I've seen live rock mentioned, a skimmer (seems a big area for this to me), refugium (what it's supposed to be now).
I've also seen a algae scrubber mentioned, which would replace my refugium. This is appealing for the space since I'm not actually sure there's technically enough space for a refugium to be highly effective (I've seen some rough volume per gallon of main and pretty sure it's higher than what I have) but it does look like I'd be in for a big up front cost to do something off the shelf(~$1k for 2 large units). It'd be a very big pill to swallow. I would also consider phasing it in as the budget allows with several smaller units if it comes out close to cost parity for the total system if that would work.
Fighting the algae:
-More flow
-I've seen more and less light. Might go dark while I'm doing the heavy water changes and then look into better lighting.
Gonna hit a few more replies here too:
I've been feeding less to try to keep the nutrients from going too crazy. I'm at about 3-4 times a week right now.
I've also tried media bags of purigen with minimal success. Some of the issue there is finding a good place to put them. I've mostly tried on the mechanical filter where they cause the filter to compact and choke flow to the return zone and upstream of the undergravel/refugium where I can't get them to stay spread across bulkhead upwelling. They tend to spill out of there and just end up floating in the refugium area.
Also tried a phophate reactor (seen in the downstream end of the sump, hanging off the tank) with phosguard. Had a devil trying to dial it in and then it also grew cyano and now needs to be cleaned out. Was going to try phosbond to see if that works any better
The skimmer is fairly similar to the lifereef skimmers in design. That's what i based it off of anyway pulling some design features from both the larger and smaller series depending mostly on what I could build. I get a moderate amount of skimmate but have trouble telling if I'm in the right range of wet vs dry. I've had times where it seems I'm not pulling much off and other times when I'm seeing mostly water in the drain bucket. I'll see if I can pull together a bit of a diagram since the opaque design makes pictures less than useful.
TBH I think its largely they were used to being fed more. The previous owners seemed to mostly feed squid rings for the larger fish, which I've had described to me as "popcorn for fish" by a zoo aquarist. We've been trying to provide a more rounded diet, but the nutrient levels have led me to feed less often. They're mostly pretty chill except when they think food is coming. I've also been told by the same folks that the central "island" of rocks is really bad for them as it encourages lap swimming, which isn't really the kind of behaviors they should be exhibiting. I'm hoping a rework of the aquascaping will maybe help destress them a bit along with getting a little more frequent but smaller feedings once I have the nutrient levels sorted.
Also tbh, while I really enjoy the sharks, and I mean what's cooler than being to tell someone you have sharks in your basement, I doubt I would want to keep sharks again. Mostly because their aggressive nature doesn't mesh well with a lot of fish and has made keeping the tank more challenging. I'd love to get a new puffer as he was one of my favorite fish, but I know they are major waste factories. For now, I'd really like to at least get the tank healthy as it stands because I enjoy everyone living in it, even if it's not something I would keep again. Right now, I'm not sure what my dream tank would look like aside from better than it looks now.
If I plan on keeping the fuge, I'll likely look into different lighting, but I'd like to keep it to higher efficiency systems so I'm not stressing our breakers or my wallet when the electric bill comes around. Those return pumps already put quite the load on, so something like a comparable LED setup would be preferable.
The fuge originally had a single 150w metal halide in a hood centered over it, which put it over a glass center support. I've tried switching to a Current freshwater LED (that died on me a few weeks ago) and a couple of generic grow lights on clamp fixtures (roughly 65w equivalents).
Filtration consists of a couple zones of bio balls (little spikey plastic balls for bacteria to grow on) followed by large undergravel filter (very roughly 24"x48") and then a mechanical filter (dual layer pad)
Ya I've been thinking along those lines, but don't really know the direction to go. Once I realized I had an undergravel and started looking up filter media for various things, it seemed like the system might be running on old ideas and tech based on what I was seeing/reading.Undergravels hold nitrates in time as does canister units. Bio balls years ago was the way to go with bacteria retention. So much has changed and I would consider in the future an upgrade to a sump filter and a reactor and protein skimmer for maximum effectiveness in breaking down waste
That... that makes sense and I really hadn't thought of it. I've also had a little trouble figuring out how much to feed since the puffer died and he was a big eater so I know there's been more uneaten food. Problem is I can't really get most of it out due to the tank sizeThe old diet explains part of your problem.
You're feeding with foods that provide more nutrition. Any uneaten food is more polluting than the old diet was, as well as their waste being more concentrated in nutrients.
A quality Skimmer is going to be your best friend for pulling out waste before it breaks down into nutrients for algae and cyano and reduced nutrients will help ease stress on the fish which improves their immune systems.
Big skimmers are considerably easier to build than compact ones. I haven't looked at the design yours is based off but just make sure it's adequate volumne and contact time. An adequate Skimmer is going to be your best option for gas exchange to keep O2 levels up. Having the Skimmer air intake line pulling from outside air will help and you can use a CO2 scrubber if it is still a problem.
A proper refugium light is going to help, something with red and blue spectrum is optimal. You just have to keep any slime algae from blocking light to the macro algae.
Live rock rubble and crushed coral beds are great bacteria growth beds but detritus is an issue. Using filter socks or a sand filter (like a swimming pool) will keep detritus out of the sump but is another piece of equipment to maintain on its own.
Let me see if I follow. So my setup would change to something along these lines:Your Skimmer works but could be more efficient. If your venturi is at the Skimmer pump intake and you install a neddlewheel impeller, it "chops" the air into smaller bubbles, increasing surface are and contact time. You would probably still need to run the jebao at full power.
Another option is to convert the Skimmer to a "recirculating" Skimmer. Remove the venturi and the jebao (or smaller replacement) pump is just a feed pump (you would not need full flow from the jebao, just whatever you need to match optimal flow through the Skimmer). A second pump pulls water from inside the Skimmer body, past a venturi, into a needlewheel to chop the air and back into the Skimmer. This would be best pulling from the bottom of the Skimmer and returning mid body, just make sure the air intake line ends above the water level of the Skimmer so it doesn't drain if the pump is shut off.
First things first, drive safe. No need to keep up with this and get in an accident on my account.If you're using needlewheel impeller, venturi needs to be at recirc pump intake.
If you're not using a needlewheel impeller, then there is no reason to change your current setup. Fine bubbles work much better than higher flow with big bubbles. A recirculating pump (no head pressure) won't have any issues moving desired water. The recirc pump should be plumbed as a closed loop. The only opening in the system is the air intake and as long as the open end is mounted higher than Skimmer water level, there are no issues.
Here is a picture of a recirc Skimmer I have used in the past. The top port on the right is where the feed pump puts water into the tank. Recirc pump pull from bottom right, mixes air in at venturi and pushes back into Skimmer at middle right. Drain is bottom elbow exiting to the left. I fed this pump (8" diameter and 30" total height) with a 600gph pump. Less flow = more contact time but your flow also needs to account for how much of the system volumne you want processed over x amount of time.
I'm on my phone in the car so I can't do any graphics to help.
I'm a passenger at the moment but thanks for the concern.First things first, drive safe. No need to keep up with this and get in an accident on my account.
Ok got it. I knew the venturi goes ahead of a needlewheel my brain just flipped it back to a standard impeller format with downstream venturi like my current setup.
Corrected setup would be more like this:
hardest part of modifying to input the feeder line high in the body would be removing the existing line since it's largely glued into place so I could have a simpler inlet
Doing the math for my current setup, Based on the flow curves for the pump, I should be around 1300gph through the skimmer. Maybe a bit more or less due to unaccounted for head loss and how high things sit in the skimmer body. I can decrease flow with the pump controller easily enough or add a valve somewhere
Contact would occur from venturi height down to about 6" or so off the bottom at higher flow (1" pipe here) and then would slow down in the
I'm using about 1.3m for head height which is close to the height of the venturi from the pump. I can't accurately determine the water height in the skimmer body so i'm mostly tuning on how wet the foam is. I've considered adding some sort of sight tube so I have some sort of visual aid, but not sure if that would even work.
I'm a passenger at the moment but thanks for the concern.
Water height isn't a big deal, just make sure the air line is up to the collection cup. Really, as long as it's higher than the highest point in the drain line, it will be fine since water will follow the path of least resistance if the pump is shut off.
You should be able to keep the original plumbing for the feed line. Only mods you would need to make to tour Skimmer is plumb an intake and outlet for the recirc pump and move your venturi. Really, your recirc pump can live inside the Skimmer, it's just easier to maintain if it's outside the Skimmer body.
There's a couple, both are called The Fish doctors, but are technically independent even though they seem to share a lot.Are there any aquarium shops around there? I know around here there are several shops with systems this size. Maybe ask them to look at there setups and ideas. Massive setup though! Good luck!
Storage bin would work fine there's plenty of room. If I went dual tower I was planning on putting them both into the same bin so I could manage any leaks easierYou can always build a shelf for the recirc pump and the Skimmer can stay in the body.
Or put the Skimmer in a storage bin instead of a bucket, depending on room.