Actually something else that has been kind of brought up is quarantine tanks and hospital tanks--different things. My QT tank (rubbermaid) is full of LR, macro algae, crabs, ect. My hospital tank is a different rubbermaid that stays dry in case I need it.
I use 40G rubbermaids since I find them a bit easier to have around than a 40G tank and IMO a 10G is WAY too small to QT most any fish.
I also keep a sponge in my DT sump that can be used in the hospital tank as a filter if needed. If you do this though, make sure you "rinse" out the sponge every now and then (I do it every water change) to make sure it doesn't accumulate detritus and large amounts of bacteria that will lead to high nitrates. You just need it to have enough bacteria to keep a hospital tank cycled...although most meds will kill the filter anyways
