I run a sponge filter in the main tank along with the primary filter.If I need a hospital or quarrentine I add the sponge filter , water and heater to a empty tank and consider it cycled.
I was thinking of doing this to. can you tell me... how do they work? and how often to clean ? and how to clean? just run them thru the bucket water, squeeze out all the stuff as I run it thru bucket water? how big to get? ( my tanks are in my sig)