what is it

New to me but hopefully not new to others. Help in the ID of these two critters? Never noticed them until this week. Long striped strings/tentacles from the rock in multiple spots. Little guy keeps slowly coming up then shoots back down anytime I get close except for if I stay for a while.

These are only in the chamber at the back where my pump is. Any ideas?

I have these white filaments all over the tank. Also have a vermetid outbreak that I am treating with bumblebee snails and manual removal. Alk is 10.5, salinity 1.025, phosphates, nitrates and pH are I in normal limits. Any help is greatly appreciated!

What are these saw it on my Zoa then on a different rock plz help

Don’t know what these are but found one growing on a rock and one growing on a Zoa Plz let me know what they are and if I should remove thx

We found this on a piece of live rock this morning. I added some snails and hermit crabs yesterday. The second picture was taken after one of the crabs turned it over.

I noticed this brown coral looking thing on one of my live rock the day after the dust settled when I first set up the tank. A couple of months have passed and it has not shrunk or grown. Can anyone help identify what it may be?

I appreciate you guys taking a look. Wish I had better pics or a microscope to help identify. Whatever this is it keeps hanging around. Mainly on the back wall (poly), wave maker, and the return nozzles. But it has been attaching/growing on my Stylos, Birdsnest and other hard corals. Causing the...

Saw this while feeding my invert heavy tank. It is most definitely NOT a bristle worm… I have several of those in my tank and know them fairly well. This guy has a face that reminds me of a coolie loach… i think it’s been in my tank for at least 8 months. It seems to be more of a rock dweller...

I just noticed two little clear tentacles coming out of the base of one of my corals. They are kind of thick and have darker tips. Are they sweeper tentacles? I was under the impression that they would only come out at night. Also, they sway around with the current, if that helps. Thanks for the...

I found these two little fellas at my local pet store and they were so pretty and fluffy and pink I brought them home and put them in my reef tank. They are growing like crazy and I have no idea what they are. I’m including pictures from front and side and hopefully you guys can help me out...