I think the Regal Angelfish and the three or four tangs are not a good idea in a 50-gal tank. The Flame Angelfish is "iffy" but more appropriate than most of the other fish for that size tank. With corals no less.
looks beautiful but nitrates have gotta be skyrocketted and 02 almost non-existant :roll: I hope he can keep it going, but I gotta feeling it'll crash someday