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The sponge filter shouldn't be a problem and is quite ideal for sick fish. Perhaps you need to buy a valve that alters the bubble output and set it to very low
Agreed.... The problem is cycling them for a hospital tank if you haven't cycled it allready...

I've been thinking of ways to have cycled sponge filters on hand. One idea I have is keeping the sponge in a canister filter running on a tank. Then if you ever need a cycled sponge filter pull it out and away you go.
 
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