How often should I remove water with my syphon and add new water? I was doing this once a week but had a very high mortality rate. The receptionist at my doctors office said to stop removing water, and only add treated water when the water levels get low. Wouldn't this cause a lot of ammonia from the waste?
It's a 21 gallon tank and all I have left are platy's. Have lost about $100-$150 worth of fish this past year :(