Whatis this?

[Luckyyluciano]

Cant get a good picture because it's so small but when lights goes off it has a long piece sticking out

 

[vetteguy53081]

Looks to be a group of tunicates which are filter feeders and reef safe

 

[SHNICI]

Also if you can photo when you see something out (just turn the lights on and shot immediately), or try to take a photo with the flash light. Video can be useful for ID what else is there.
At the moment like @vetteguy53081 group of Tunicates