I heard that they melt but how long does this take? We have had the tank for around 15 years and somehow the temp got turned up and it was about 90 degrees. We got it back down over an hourish time period, but he is not moving much or maybe at all. Since he is normally always hanging on the side since we got him I don't know how to tell. He is just sitting on the ground of the tank. If you pick him up (we had to to move him until the water was adjusted) if he is upside down he curls that way and then goes back flat when you put him down. This is the first starfish or really first real pet we have had in the tank so I have no clue what to do. Oh, yeah he is new to us only about a day. Hes a chocolate chip starfish.