We have a hospital tank, but it isn't big enough for everyone. Does the rubbermaid need a filter or skimmer? Or a powerhead? What would produce oxygen for them?
We have a 40 gal. With 5 fish. 1 blue regal tang. 2 clown fish. 3 chromis. All one inch or less in size. Everyone seems to get along fine. Haven't seen any bullying. The water parameters always check out good. Ph- 8.2-8.4 Ammonia/nitrate/nitrite- 0. calcium- 480. Salinity- 1.024. I can't think of all the other tests, but I know they are always in the acceptable range.
We placed 2 clowns in the tank without hospitalizing them, when we bought them they had no spots. The next day, they did. Then their spots went away. 3 days later, everyone has them. All fish are swimming pretty well & eating as normal.