Hi, I am planning to set up a permanent hospital/quarantine tank after having a sick cory and nowhere to treat him (He didn't survive as the first tank I bought as a hospital emptied itself overnight with him in it
).
I have a 20l/5g tank that I plan to use but was wondering whether to keep it to one side and use it as and when needed (small filter left running in other tank in the meantime) or to have it permanently set up with a couple of fish in to keep the filter going. Is one option better than the other? Is there a species of fish that would suit this kind of thing (it's more likely to be a hospital tank as opposed to a quarantine tank as I don't intend to add any new fish to my other two tanks). None of the fish that would be put in the hosp tank are big (tetra, dwarf pencilfish and corydoras).
Thanks, Jo

I have a 20l/5g tank that I plan to use but was wondering whether to keep it to one side and use it as and when needed (small filter left running in other tank in the meantime) or to have it permanently set up with a couple of fish in to keep the filter going. Is one option better than the other? Is there a species of fish that would suit this kind of thing (it's more likely to be a hospital tank as opposed to a quarantine tank as I don't intend to add any new fish to my other two tanks). None of the fish that would be put in the hosp tank are big (tetra, dwarf pencilfish and corydoras).
Thanks, Jo