ok so once some red terror fry i have grow out i will have a 20g Long that i want to do as a planted tank, was thinking about fish to put in it and iv always had a soft spot for angels but never actually kept them, would i be able to keep maybe 2-3 in this tank? i thought they stayed small but then i was looking around and seems they might get bigger than i thought, exactly how big do angels get, would they stay small enough for a 20L? and what other fish would be good tankmates for them that are small enough for this tank?