was just a few, now a few short weeks later they are taking over the tank and getting really long

Hello all! I found something in my tank today and I have no idea what it is,.. it almost looks like a baby hitchhiker cucumber. In this picture it is on the back glass of the tank. Can you give me a clue as to what this is, an if it is reef safe? Total size is about 3/4 inch long so if it is...

Hi all New to the forum, first time post. I've setup my first ever marine tank and am loving it so far. I thought I'd learn as I go - bought some books, been browsing forums etc. I think I've got the basics covered, but I'm clueless about identifying things! The cured live rock that I bought...

Does anyone know what this is it came off my rock one day it was on the back glass the next at the front on a rock not sure what it is

Just seeded an above display refugium and i noticed a very large critter. After doing a bit of research i figured that it is an isopod but I am having problems determining if it is a bad one or not. Anyone know?

Well I've had enough of this Gorilla crab. Today when I got home from work, I checked in on my tank only to find the reminiscent of a gorilla crab shell. The little bugger had Molted since last night. I decided that I can't let him get any bigger in my display tank. I haven't seen him yet...

I have spotted a hairy crab that keeps appearing in a rock crevice over the last few nights. I wouldn't be able to grab him, so I'm wondering if there is a way that I can lure him out to catch him or if anyone has an idea or method to catching rogue crabs. I could just attempt to stab him and...

Hey Everybody I need a little help here. I bought this piece of live rock maybe a week ago and I just noticed these little guys growing. This piece turned out to be a nice one. I got all sorts of surprises on it including these tube like filter feeders, what appears to be the start of some...

So I have posted this picture before and much to my dismay was not granted a solid answer so.. A bit of an update. I found this tentacle-like thing reaching out of my live rock one night about a month ago.. It was light sensitive and very hard to photograph as it hid when I got a flashlight on...

Hey everyone, I am new here but have been using the forums for advice on my nano reef (10g). I just had a question on IDing a hitchiker on my live rock.. I just noticed it oday after about a month of starting up the aquarium. Anyhow it appears to be a white opaque tentacle reaching out of one of...

Does anyone know what these things are and if they are ok. The end not attached to the rock has lots of short hairs. I was worried they are baby Aiptasia but has hairs at the end not tentacles, also they don’t retract into the rock when touched. The macro photo shows a ballpoint pen next...

Hi guys, i noticed some small longer white parasites on my naso the other day so i reluctantly did a freshwater dip... and they didnt last long. i then took some and put it under the microscope... this pic is at 40x. anybody know what it is???????

Have never seen this until tonight and I have no clue what it is. I have it out of the tank in water now not sure what to do with it.

Hello, First time posting here, I have a well established 30 gallon saltwater, this is not my first saltwater tank, i have lots of experience, 25-30lbs of live rock, water condition is pristine, several types of mushrooms and corals, 2" of live sand, I recently started adding fish and inverts...

I'm on a day or two into cycling my first take only have live sand and live rock. Noticed this morning a very small white dot and its moveing slowly. Kinda like a snail but unsure since its to small to tell. Any thoughts? And will this servive the cycle? Thanks

hello i have found a black and white sea slug flatworm nudibranch thing. the stripes are allmost the same as a black and white clownfish. its only a few mm long so it will be hard to get a pic. anyone no if i should put it back in the tank or not? what is it? it does not seem to be as flat...

hello i have found a black and white sea slug flatworm nudibranch thing. the stripes are allmost the same as a black and white clownfish. its only a few mm long so it will be hard to get a pic. anyone no if i should put it back in the tank or not? what is it? it does not seem to be as flat as a...

I think this is a bristle worm but not sure the black head on it throws me a bit. also how can i get it out of my tank i just don't like it. thanks for the help.

Hi, I have this weird stuff growing of my live rock, seems to be mainly around 1/2 peices of rock next to each other & is growing in the darker/shaded areas. Dont know if you can tell from the pic but it is a creamy/light yellowish/near transparent in colour & flares out at the end (a bit...