This community would fit a 55 gallon tank. You would simply get less fish or use more filtration in order to have less water.
(3) “Gold Koi” Angelfish (Main event)
(1) Gold dojo when I see one
(3) Buenos Aires Tetras
(3) Zebra danios or (3-5) Pearl danios
(2) Albino Cory cats or similar
(3-5) Tiger barbs (Green if available)
(1) Plecostomus when algae appears
(3-5) Serpae Tetra
(2) Ludwigia Plants
(1) Amazon Sword
PH Pills