frogdog
Relentless Question-Asker
I've read that it can be useful to keep a sponge or small filter (like would fit in a mechanical filter) in the sump, so it has bacteria on it if you need to set up a Qtank or hospital tank. But if you're moving a sick fish from the DT to a hospital tank and set up a mechanical power filter, wouldn't that sponge bring some of the microbes with it that you're trying to get rid of, into the hospital tank?