I have minnows, feeder guppies and mosquitofish in my 20 gallon. I was treating with kordon rid ich plus and then i ran out. Then i was using this petco preferred herbal ich treatment. I ran out of that also so i got some Kordon ich attack. I have been battling this ich for months and it still has not gone away. It says on the bottle that the kordon ich attack treats 960 gallons and i have already used over half of the bottle on the 20 gallon tank. I am probably going to get some more rid ich plus because that has worked the best for me in the past. It does not appear to be getting worse, but it does not appear to be getting better either. The ich attack should be working. What should i do?