Pest Issues! help!

[Beano1169]

^^ These white guys look like little worms coming out of the rocky, and are somewhat fuzzy looking.



^^^This thing looks like a brown leech with small bumps on its back. Kinda freaky, I will point out though the hammer coral seems fine and isnt suffering from any seen issues.



^^^these dude looks like little hairy sticks I think I know what they are but cant remember off the top of my head. latin name starts as a hist--- hysio-- someting ahha



^^ these effers are everywhere, little whitesnaily dudes which I assume are the sundial snails I have only seen on Big on in the tank so far but like 30-50 little guys




^whats happening here is I see little white spiky strings coming from under my GSP, also I see these strings all around the tank at night time and they kind of look like a white wrecking ball with stickyspiky hairs on the wire and the end part.

any ID on these things would be greatly appriciated as I can find nothing. Thanks for your help and suggestions