You didn't ask about this but I'll just put my two cents in... I think the most challenging thing about a hospital or QT is keeping the ammonia in check. This is dependent upon the size of the tank, the number of inhabitants, whether you used some sort of "seeded" material etc. But remember, if you don't have the benefit of the biological filter offered by the live rock, there is great potential for the ammonia to rise quickly. IMO those ammonia badges are not all that sensitive. They work, but not before you have a significant amount of ammonia. Plan to test the water frequently (daily is best) and do frequent water changes. On a 29 gallon hospital tank with 4 fish, I needed to do 10-20% water changes every other day.