As long as you keep up the WC's, I'm sure the fish will be fine. I was just messin with ya. I do think you should invest in bigger heaters, though. Those little guys will have to work too hard & that increases the risk of malfunction. Colder water slows the cycle down, so if you're gonna buy a new heater anyway, get a Hydor Theo thats rated for the whole 100 gallons, then just use the small heater down in the sump.









