Whats this brown stuff on my rocks?

Gumbies R Us

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Embrace it don't fight it. Trying to fight the normal progression of things will only create problems IME
I second this. I would just let the uglies do its thing. I had a pretty bad case of diatoms and green hair algae. I had to manually pull out a lot of the algae and get some snails in the tank. Now? I have Coraline and and virtually not nuisance algae.
 

maxberter

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Your white rock is going to turn brown then purple/all sorts of non-white color. It is normal, don't worry about it and don't try to stop it. Buy some snails to keep it in check, or urchin once you have a lot of algae growth.
Here's what happened to my white rock after 1 yr:
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20240610_194349.jpg
 

Frenchy

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As someone mentioned, just do your water changes and be patient.
 

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If I turn off my lights will diatoms stop?
As said previously you should not try to stop it. It is a sign you are on the journey to a mature reef. Diatoms are not a problem. If you want white rocks a reef tank is not what you want or in fact any saltwater tank or most freshwater tanks for that fact. Let the tank mature dont fight it.
 

paragrouper

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Welcome to life in your tank. This happens to all healthy tanks—and it’s just the beginning. Especially if you add live rocks. Your tank will have all kinds of interesting growths on the rocks.

This link is a good example of what you will be adding with live rock Link

Your PO4 of .12 really requires no action at all. Nor do the nitrate levels you stated. You are doing well.

What you need to do is monitor your tanks parameters and avoid adding unnecessary chemical additives. As others have stated, diatoms are part of the maturation process and they will resolve themselves as your tank matures.
 

PharmrJohn

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If I turn off my lights will diatoms stop?

IMO, lights should be left off during the cycle. When I get mine up and running, lights will be left off for 2.5 to 3 months. Also, don't be shy about dosing something like Microbacter7. A lot of the issue is the lack of competition for space on your rocks. If the bacteria is coating the rock sufficiently, there is for less chance for other organisms to attach and thrive. But as others have stated, above and beyond this, just wait it out. It'll level out and go away.
 
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IMO, lights should be left off during the cycle. When I get mine up and running, lights will be left off for 2.5 to 3 months. Also, don't be shy about dosing something like Microbacter7. A lot of the issue is the lack of competition for space on your rocks. If the bacteria is coating the rock sufficiently, there is for less chance for other organisms to attach and thrive. But as others have stated, above and beyond this, just wait it out. It'll level out and go away.
My nitrogen cycle ended already i think, as no more ammonia or nitrite, what is this other cycle?
 

paragrouper

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My nitrogen cycle ended already i think, as no more ammonia or nitrite, what is this other cycle?
There are different schools of thought on how to cycle. Some folks prefer to leave their lights off for an extended period of time, to reduce unwanted uglies. As you are adding live rock, this is likely not a good alternative for you..

Depending on the quality of the live rock you purchased. You may very well be Importing creatures that will benefit from light. An example is a blushing star coral that came in a shipment I received from Tamps bay Live Rock. I also had a bunch of filter feeders, sponges, and a few different types of of macro algae.

IMG_3151.jpeg
 
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There are different schools of thought on how to cycle. Some folks prefer to leave their lights off for an extended period of time, to reduce unwanted uglies. As you are adding live rock, this is likely not a good alternative for you..

Depending on the quality of the live rock you purchased. You may very well be Importing creatures that will benefit from light. An example is a blushing star coral that came in a shipment I received from Tamps bay Live Rock. I also had a bunch of filter feeders, sponges, and a few different types of of macro algae.

1722104233445.png
1722104207647.png

I havent really seen any animals like snails or crabs, but i did see feather duster and bristle worm so far
 

ZzyzxRiver

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Diatoms will stick around until they have used all the available silicates in your water, and then they will disappear without a trace. In my 16g tank, one strawberry conch and one Trochus snail cleared every day’s growth overnight every day. Don’t stress about diatoms, because there is SO much left to come! I am at three months and so far I have had phytoplankton blooms, hair algae, spiorbid worm blooms, bubble algae, and I expect more weird stuff to come. A huge part of the satisfaction of this hobby for me has been encountering the problems, and finding the right natural way of controlling it and watching the problem resolve over time.

75% of my questions still have same answer: be patient. I’m still not patient, but at least I understand that I’m supposed to be, lol.
 
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Diatoms will stick around until they have used all the available silicates in your water, and then they will disappear without a trace. In my 16g tank. One strawberry conch and one Trochus snail cleared every day’s growth overnight every day. Don’t stress about diatoms, because there is SO much left to come! I am at three months and so far I have had phytoplankton blooms, hair algae, spiorbid worm blooms, bubble algae, and I expect more weird stuff to come. A huge part of the satisfaction of this hobby for me has been encountering the problems, and finding the right natural way of controlling it and watching the problem resolve over time.

75% of my questions still have same answer: be patient. I’m still not patient, but at least I understand that I’m supposed to be, lol.
I can relate with the lack of patience xd i just want all crazy looking corals :grinning-squinting-face: :grinning-face-with-sweat:
 

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