This sounds crazy but I was thinking of having a Single / Pair of OSFF in a 20 gallon (UNS 60U)? It/they would be the only fish in the tank, Macro Algae / NPS Sea Fan dominate. I would either get them from Divers Den or a LFS, both I know take frozen and pellets. Im probably going to upgrade the tank in a year or so to something of more of a 40-55, so would this be able to work?