i have my new 500 gallon pond and i have been trying to find something online that can heat it up because i live in florida and i have peacock bass and were i am in florida it gets just cold enough to kill them but all of the pond heaters online are known as pond de-icers and they only turn on when the water is at or below 32 degrees and the water here will never drop below 32 so i dont know what to do could you guys help me out?