I know this is very very frowned upon but I have a 1.5 gallon tank with three gold fish and it didn't have a filter. Now I know the tank is to small to begin with and as they grow it will only get worse. But for right now they have been doing fine for a couple months. I have been cleaning the tank very often. I decided last night to go out and purchase a hang on filter for a tank up to ten gallons and put it in. The water already looks better. Is this okay for now?
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Sent from my iPhone using Aquarium Advice