Quarantine Tank vs. Hospital Tank???

Use, you're right on track. Yes, they can be the samt setup, though not used at the same time. For quarantine, you want to keep the fish confined so you can treat if needed, and verify that the fish is eating. Time's vary--I prefer to quarantine for 4 healthy weeks--meaning if the fish is fine for one week, then sick for 2 week, it stays in there for the next 4 weeks and is healthy for those 4 weeks before going in my tank. This means a total of 7 weeks. Others go even longer--it's a matter of your comfort level, really. I use the same pattern for hospitalizing them--they go in sick, heal up, and are healthy for 4 weeks before returning to the main tank.

I do not keep mine setup all the time. Instead, I have some sponges in the main system sump--they are colonized with bacteria, and ready for use. As needed, I pull on out (replace it) and put it on a powerhead in the tank. I always use new;y mixed water--parameters match, no import of wastes. Add a heater, bring to temp. Add some hiding places--chunks of PVC, fake plants, terra cotta pots, ect. Then add the fish. No substrate, plan for daily water changes and cleaning.

When the fish goes back in the main tank, I empty the SW, soak everything with hot FW and oxyclean. Rinse, dry, return to storage.

I have a variety of tanks to use--the main thing is to have a tank that will hold your largest fish. For example, if you plan on having a large angel that gets up to 15 inches, you need a q-tank that will hold ad least him! For most people, something around 15-20 gallons will work fine. And it doesn't need to be a tank--large, stiff sided rubbermaid tubs work well. I don't put a light on the tank--it's easier to have a flashlight for examining the fish. In terms of putting it up--I usually put down a piece of wood just bigger than the tank on the floor, level it, and put the tank on there. Easier to work in and clean at the lower level, and doesn't require any moving of furniture. I will cover the tank, either with glass or with a terrarium style cover, to prevent fish from jumping and to keep out the cats.

I like bigger tanks. Went from a 65 to a 120, and love the 120's.

There are some angels that can be kept in a reef tank, and most tangs are reef safe. Some larger angels may go after inverts or graze on some types of corals. Dwarf angels vary widely--most are safe to some degree, but willl nip at fleshy polyps. Triggers--by and large, not reef safe at all. A few--blue chins, for example--are safe. The thing about anenomes--they are tough to keep alive. The average lifespan in the aquarium is 2 years--but they live for hundreds of years in the wild. So, if you aren't set on having one, don't! The clowns will adopt just about anything as a host and be very happy, even spawning, without an anenome. Unless you get predators like triggers, puffers or eels, there will be a variety of crustaceans you can have, and not focus too much on corals. Still a very interesting, attractive setup.