Do quarantine tanks and hospital tanks need cycled filters? I imagine the quarantine tank does, but what about the hospital tank? If you’re treating sick, injured or diseased fish and medicating them, some medications I’ve seen say to remove the activated carbon thereby simply making the filter just an aerater, which in the case of a hospital tank, it’s a good thing so that none of the medications get filtered out of the water. Did I get that right? And the quarantine tank is simply used, overall, as an observation tank as a precaution in case fish develop problems.