SDROBBIEFISH Posted March 29 Share Posted March 29 I have a fluval 9 flex and I noticed the filter reservoir was not filling to the top. I have the heater where the pump is and when the water level is not at the top the heater will turn off. I didn't think of that until after the fact. The heater was turned off for a couple days. I noticed my guppies were swimming lethargic. I checked the heater. I turned it back on. I did a water check. Everything was good. I did a partial water change. Most of my guppies look fine except for the two males and one female. One male just passed away and the other looks like it has something white on it or it's a gash. The female is slowly coming around. Can a heater not on for a couple days affect my fish in such a way? Link to comment Share on other sites More sharing options...
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