good or bad

I dont know if this is a worm or a spider star fish. I have not bought any star fish nor have I added anything to the tank in a very long time! I assumed they are worms but I dont know what type and if they are good or bad

Can anyone please tell me what is going on here? Do I need to try to vacuum the things out? I also see some copepods hanging out with them. Please let me know cause my water changes this weekend. Do I need to do a heavy vacuum or just water change. I believe my clowns have been eating them...

A couple weeks ago I added a half pound piece of live rock to my nano as an island for the mushroom I’m planning on adding. Today I noticed this really small thing that looks kind of like a polyp on the rock near a hole. Any idea what it could be? There’s also a similar looking one towards the...

Hey y’all, I posted on the first worm I found like a week or two ago and only got one response. But I just for another one and he’s a little darker than my first photos so maybe it tells y’all something different. He’s so small I found the sweet spot where my phone would focus. I haven’t put...

Hey everyone I’m Nick! this is my first post! Just wondering if anyone is able to identify the little things swimming near the top of the tank in the red circle when I shut my flow off to replace the filter floss. They seemed to be squirming and swimming pretty quickly! I feel like they could...

Please if anyone could let me know, I found a small snail on my newly bought chalice frag, there's plenty of snails in these tanks at the LFS where I purchased it from... Could someone pls help me identify it & let me know if it's good or bad?? Thank You so much.

Is this a Berghia or zoa eating nudi?

I'm setting up a sexy shrimp and rock flower tank. A waterbox 4g. I've had it running a couple months with only a few rock flower nems. Recently bought gsp from a local reefer, and noticed a rather large (2+inches) bristle worm try to steal food from a nem during the last feeding. I presume he...