hitchhiker id

Found this guy while doing maintenance today, doing so research I believe that it's a Sphaeromatid isopod, can anyone confirm if that's correct and he's reef safe?

Good or bad?

So I have a piece of now dead coral I dont want to throw it as it has a bunch of stuff on it, feather dusters, and a turnicate. Today while feeding my coral and having all pumps off is notice this black and white worm looking thing moving. Any idea of what this is??

A few various sizes of these curious and very energetic, wriggly guys came in my live sand today and I was able to grab a couple with tweezers and throw them in a bucket. Was tough to focus the video, looks to me like it might be lancelets. Could anyone confirm...

Noticed these weird purple growths on my zoa and duncan frag plugs. Can anyone tell me what this is?

Recently discovered two of these guys in my tank. Must've come in on a frag (despite dipping) or maybe a snail. Kinda looks like a ball anemone but I can't tell. The two I have are in darker areas and mostly clear with a little color under blues. Tentacles radiate evenly around the mouth plate...

Hello, I need help to id this hitchhiker! I bought a colony of discosoma mushrooms a while back and I notice colony of polyp-like hitchhiker beside the mushrooms. Some of the mushrooms that close to the polyps kinda shrunken.

Finding hitchhikers (benign ones especially) is actually one of my favorite things about reef-keeping! And today I noticed a new friend in my 1.5 gallon that I most definitely did not add. It’s a beautiful little crab, but not particularly active— I’ve never actually seen it move, just sort of...

Hey guys Everything’s been going so well in the tank and everyone seems to be happy! Just one small question…I have 2 red legged hermits that do occasionally latch onto each other n then let go after a few minutes, I tend to leave them to it as there are plenty of shells for them to change...

Hello! Rescued a sizeable pectinia that had a couple pests on it. It had a large vermitid that I glued over, a majano which I injected with lemon juice and covered with CA glue. There is a red sponge which I hope lives! BUT...What's in the picture? It looks completely different from the other...

I've tried to ID these guys, but I swear they look like 10 different worms when I tried comparing pictures. This is through one of those phone connected microscopes, as the worms were crawling through the sand. They're about 0.5in long, super thin, and white to the naked eye.

I went over to look at my tank tonight and saw a snake like creature in my live rock when I tried to take a picture of him he retracted into the live rock so in the photo I just have part of him.

I got this elephant ear mushroom a couple months ago. It's usually hand size but today it's been shriveled up and I noticed these on the rock that has been hiding under the coral. Seeing if I could get an ID on them. Good or bad?

Happy New Year to All! I introduced my first corals last week and now find a number of mystery guests on my glass and possibly in the water column. Can anyone tell me what these are?

Really curious what these are. I've searched the internet on and off endlessly over the past few months to no avail. One or two has turned to a couple dozen and I'm wondering whether I need to take action. They haven't died off like pineapple sponges usually do. They look like a cross between a...

Hello, Can anyone help me ID this small orangey-tan anemone that arrived on my Pom Pom macroalgae? Surprised to see something show up like this from Algaebarn. It only appears to be on one clump of many from what I can see, but in case its aphasia I will remove all the other pieces for inspection.

I was just observing the tank as I do and noticed this little critter come out from a hole in the rock. It looks like some kind of shell-less snail or slug. Any ideas on what it is and if it's good or bad?

Hey all Sorry I’ve been a right pain with questions this week but final couple from me! Can anyone identify these? 1) grey patch which is slightly raised, seems to have spread slightly the past 2 weeks Struggling to get a pic as it keeps disappearing but also have a very small feather...

I noticed this growing on a piece of my gsp. The gsp hasn't seemed to extend its polyps for a while so I'm wondering if this is the case. Any idea what it is?

Hey everyone! Back again with another critter ID! Found this clam-like critter on one of the shells that this hermit has been carrying around for a while At first I figured it was just some sort of abnormal growth from the snail that used to call this shell home. I noticed recently that this...

I picked up some coral from a local dealer and found this guy with one of my favia’s. Seems to be a snail but not quite sure. Don’t know if I should let him loose in my tank or not.

I've scoured hitchhiker id posts here but cannot seem to find anything similar. Would appreciate some help. I noticed this yesterday at lights out. Reacts quickly to any sound, movement or light changes. Tank is 3 months old with live sand.

^ Top view ^ Bottom view What is this hitchiker? Looks like a fireworm due to the glass hair spines but its too short to be one and the belly looks like a suction cup type deal similar to abalones

Found this guy on a small chunk of liverock I just added to my nano tank last night. Is this an aiptasia? I've already removed the rock it is on from the tank just in case, but if it isn't aiptasia I'd like to add it back since that stuff is expensive. I don't usually use live rock so I'm...

(Tank Move and 8 week update posted in replies, July 30th) Greetings! Doing a bit of an experiment. I will get into more details as to why I am doing this particular plan in future posts. For now, the short version is that I am starting a 10g nano tank as a QT/Observation tank for live rock...