I'm with you Sven, You keep the extra sponge filters in your main tank, then transfer them and fill the empty tank with clean water. 0 nitrate, 0 nitrite, 0 ammonia water is the best cure, so I don't recommend moving tank water to avoid cycling, thats what the sponge filter is for. I used to just let my quarrentine/hospital filters dry out, but now I'm bleaching them. Seems to be somewhat hard on the foam, though. Maybe I should just buy new ones.
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