pest identification

Saw what I thought was a bristleworm on my coral last night, it went into hiding before I could grab it. So I waited, and snagged up the first worm I could see this morning. Regardless of what this one is, I flushed it. But I know there are more worms, and need to determine if I’ve got to make...

Got you — here’s a smoother, blog-ready version that keeps your tone but cleans it up and flows better: I’ve noticed these worms in my sand bed from time to time during the day, but lately I’ve been having issues with some of my corals. Because of that, I started checking my tank at night to...

Good morning, Hoping to get an ID on these little buggers. They don’t seem to be bothering the coral yet and I don’t even see them on coral. Mainly on rock and the glass. There aren’t that many as of now but I have heard nightmares. I just bought a 6 foot reef tank and am about to start the...

No clue what this could be, single polyp, 3/8" across approximately. Does not feeble any coral in the tank, closes up and opens with the lights. I do have a small hydroid (I think) on an acan, other than that I have not seen any clear pests or hitchhikers in the tank other than some worms I had...

Around 4 months ago, one of my Acropora (Acropora gemmifera) that was previously doing incredibly well suddenly lost its shine and spiralled into a decline of health that subsequently led to its death around 2 months ago. The cause, to my shock, was a species of amphipod. I am unsure of the...

Just wiping down my glass, and I have noticed some sort of hydra or something on the glass. Has anybody seen one of these before? It’s tiny my apologies for the picture.

Hi everyone, I'm new to Saltwater, but I've kept planted freshwater for a couple decades now. It's nice to meet you all and thank you for all the discussions. I'm learning a huge amount. Anyway, I have a small 10g frag quarantine tank and I recently discovered my xenia is covered by small...

Hello all, I would still consider myself new but informed in this hobby. I have two weird growths happening in my tank. One of which is a white/grey fuzz on my rocks and I first noticed it on the bottom of one of my hammers skeleton (not in it or by its head at all)...I asked reddit and they...

First picture I thought it was a baby snail. Second picture is blurry I know, I’ll try to get a better one, but those critters shy away from light, isopods maybe?. Any advice would be much appreciated.

2 month old tank, started with live rock. Noticed this small black "tube" looking things protruding from the rock last night. Maybe 1 or 2 other places as well. Is this something to be concerned about (vermatid snail?). It could have been there the whole time, I'm not sure... Feels like...

Anyone know what these are? They are tiny worm like looking things. I have an idea of what they may be but not positive. Found them inside the skeleton of a dead alveopora… removed it from the tank to detach it from the frag plug it’s on. I try to leave behind coral skeletons in my tank hoping...

Coral Only tank, no fish/inverts. Any idea what this little tentacle is? I recorded one of them but I see 2 short ones and 1 slightly longer one. If a pest, any advice on how to remove it?

So I recently have gotten several new corals. One of the Alveoporas I got still hasn’t extended its polyps but still has its bright green color. Part of it looks like about 1/4 of it may have died off. I pulled it out today and use my seachem reef dip on it thinking maybe some type of pest was...