I think it was my fault. We had a cold front move in the night I got him. I checked the tank this morning and before I turned on the lights the temp was only 75 degrees. One heater was not working at all. It was a new heater. A cheap one. Thankfully I had got worried about something being wrong with the tank yesterday after the flame died and moved all the coral to my small tank yesterday. The only thing I didn't move was my fire shrimp because I was afraid to put him in to a 30 gal tank that has a big coral banded shrimp in it. Fire shrimp seems ok so far. A real heater with a separate controller will be here tomorrow. When I found the flame he was still alive but couldn't swim right. I guess I just panicked and wasn't thinking straight and blamed it on the powerhead. Now I'm still worried about the fire shrimp. He is staying near a heater and with the 6 t5 bulbs tank should warm up soon. I also put every heater I have in there but they r not for that big of a tank. And it will be tomorrow afternoon before the new heater gets here. Any suggestions would be greatly appreciated. I don't know of anyone near me with a saltwater aquarium