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Really depends on how much room you have, and what type of tank you have: could need a HOB or internal model.
as for as a 20gal long goes, it has pleanty of room. note the sustrate is about 1' - 1' 1/2".
itll house acropora, montipora, and zoanthids. mabes some hammers or torch with a plate or chalace. and 1 young yellow tang 3-4 other small fish, few crabs, a orange lukini, and derotive macros. all small. it has plenty of rock from a well established, long lived display tank refuge. so just missing a good size, quite skimmer.

