Feather duster looking thing. It doesn’t react to light. It reaches out for fish food looks like a feather duster and that worm from star wars had a baby
Homie you circled something under blues in a shadow. I don't think anybody could accurately positively ID that that without 50% guessing. Can you get a clearer picture out of the shadow under white lights?
Looks like a majano anenome or maybe some kind of barnacle it's hard to tell from the pic as stated by @Lost in the Sauce 85% sure it's a mahano tho next time ur sucking out detritus just suck him up it's better then it splitting and stinging