Would appreciate an ID on this hitchiker

These polyp types appeared from nowhere, very small, about 4-5 months ago. They are now about 3/8" in diameter, and are spreading. They do not appear to be growing in size. Occasionally they display very thin sweeper tentacles that wave in the breeze. They are not visible now. The polyps shrink a...

it’s not a bristle worm, what is it?

For the last few weeks, on the glass I see what look like very thin skinny white worms. They’re almost translucent, and they’re snake like in that they look like a billion switchbacks. They’re maybe 2 or 3 inches on the glass, but if you pulled on both ends, they probably would stretch to 6 inches...

Sea Cucumber has stuff coming out of it.

Hello , I need some information and advice immediatey. I just purchased a sea cucumber Holothuria floridana yesterday. I notic this evening that it is very thin and has some clear almost white stuff hanging out of the end of it and it is very thin looking compaired to earlier in the day. It is still...