Hi this is me with bucket hospital. I put a heater in the bucket but it doesn't work. Is 75 to cold for a tropical? I als think my main tank heater is not working the temp there is 75 too. It was 80. The light keeps going on and off like its working, but the temp has dropped. I've turned it up and I am watching it. Will the fish get sick if I don't have a heater? I have gourmi's, rosy barbs,catfish,sailfin mollies and glass fish. The bala shark in the hospital tank. 
a bit below and a bit above that temperature also does them no harm!
