critter id need

Hello all! I was cleaning and moving some corals around in my tank and found that near a colony of some zoas there appears to be some kind of brown clove polyp growing around them… which is weird because I’ve only ever had firework cloves in my tank which are never brown, even when young...

Are these amphipods or something else? There has been an explosion in my tank over the last week or so, they are all over the tank and sump. https://share.icloud.com/photos/0f5w9F-iFzBHAAxsTp4Al_PmA https://share.icloud.com/photos/07fg7Vgaf2gW2mb5Bkdf6k4Pg

I got my first batch of coral frags on Tuesday. I dipped them using CoralRx put them on new frag plugs and put them in a QT tank. I noticed what looked like little white hairs or tentacles on the stony base/skeleton of one of the acan frags. I took some pictures to post to ask if this was normal...

Is this a group of small feather dusters on my frog spawn?