sick starfish

Ever since July 22nd, my starfish has been in quarantine because I accidentally overdosed on Algaefix, and he got sick really bad. He gotten better at one point but he is getting worse again, his wound/cut is releasing white fuzzy stuff, he keeps producing slime, and he is curling his limbs, I...

We received a shipment of sand sifting stars, 2/3 did amazing however one arrived falling apart and melting. His central disk and parts of the legs closest to it are fine. I cut off the rotting parts of the legs and he is in a hospital set up with Neoplex and daily iodine dips. 24 hours later...