critter id needed

Hello, we got an aquacultured coral several months ago. We dipped and scrubbed it and tried to remove any pests. However we have found these structures growing on the bottom of the mount, it has spread to around the mount. They seem to be light sensitive and will get larger at night time, and...

Woke up today and noticed 6 or 7 of these on glass. Never seen before. Hope that the photos are clear enough.

I have all of a sudden noticed a large amount of white critters on my rock where there’s algae and on my glass when the lights have gone out. I’ve dossed copepods before however they never looked like this ... Any ideas many thanks. please see images below tried to get best images in...

Hello, I think these might be acoel flatworm, I am not sure if that is correct. I am wondering if I should be concerned about these tiny guys.

I hunted around the hitchhiker and critter I.D. forums for a while now and haven’t seen anything like this, if it’s there and I missed it I apologize. I turned off the blue light for this picture, critter in question is to the right of the little gsp clump. Antler looking thing started from...

Was chilling in front of the tank this morning and observed some spawn being released. At first I thought it was brittle stars spawning which I’ve seen them do before. When I looked closer I saw a small round critter, with antenna, and these two pink protrusions where the spawn was being...

this sponge just kinda…. Appeared? any ID on it? Is it harmful to my reef? I’ve been reading mixed information on it. Thanks so much! And have a wonderful day (Sorry for low quality image)

Hello, Could someone help me ID the critters/hitchhikers in the attached pictures? The picture with the “snout” is located in the sump of my AIO, the white specs are located on the back wall in my display near where my clowns hang out. Tank is approx 1 year old and parameters are good baring...

Hi New reefer. Is this aiptasia on our newly acquired turbo please? https://youtube.com/shorts/9e1iWOD-e1c?feature=share Thanks in advance. Iain

I have a lot of white specs appear on my glass. They are pure white and move very slowly if at all. I managed to get a sample under the microscope. I have a few trochus snails in the tank which have been releasing eggs lately after a water change. Can anyone help ID them from the pics attached...

Attached are photos of gelatinous blob found in tank this morning. Sitting on top of some Feather Caleurpa (might not be spelling that right but the green seaweed) there is this white blob, about half an inch or two centimetres in diameter. Tank is FOWLR, emerald crabs, starfish and astrea...

Hey everyone, I found this guy in my aquarium, I took it out just in case it’s bad. Would anyone happen to know if this is a good guy or bad guy for future reference incase I see more.

Anyone know what this is growing in my refugium?

We just bought our first batch of livestock for our first marine tank yesterday. We bought 6xCerith, 6xTrochus, 6xNassarius and 6 red legged hermits. Looks like we are losing the crabs slowly. I think 3 are already gone (24 hours). I caught a Nassarius smothering one, not sure if he was...

Hello fellow reefers. I have just noticed that my conch has some weird snail or limpet critters attached to the backside of his shell. A tongue comes out and picks at the sand and then retreats back into the shell when the conch moves. does anyone know what they are ? If so are they safe to...

Wassup Reefers, found this tiny orange legged crab hosting in my elegance coral today. Anyone have any idea what it is or if it’s bad for the corals health?? Thanks in advance!

I have a hitchhiker or critter of some sort in my rock. I thought it was a hair algae but it will retract into the rock if I try to tweeze it out. And now I see it coming out more than one hole in my rock. Any idea what this is? Is is safe or do I need to figure out how to destroy it?

Noticing this thing growing in the tank out of nowhere. Not sure what it is?

I think it’s a baby brittle sea star but not sure came on some live rock I just purchased.

Just found him under some clove polyps. Looks like a flatworm but I'm not sure

I saw this while looking at my tank at night while my lights were off, is it aptasia? Sorry for the bad picture

Any idea on what this is. Found it when inspecting frag of rock that had zoas I purchase

Hi all A little help please, found this guy. Do we think keep or get rid? I think its some form of asterias and read differing views on them? All views and advice welcome.

So my daughter found this in the QT tank today. Any idea what it is?