This almost sounds like too large of a heater in too small of a tank.

What size was the tank and heater?


"Sneaks" wrote in message
news:SAr2b.255488$o%2.117232@sccrnsc02...

down to high 50s......until while at work it malfunctioned and I came home
to green water, a disgusting smell and 12 dead fish....the temp went up to
175F.....the poor things......moral of the story....buy a good

Sneaks