You could probably get a few different colored severums if you want something to add some more color to the tank. Some larger geophagus would also do the trick.
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Geophagus species, Discus (i have atleast), Satanoperca species , heros species. Theres plenty to chuce from, personaly i love the satanoperca and Geophagus.. I would keep fish from the same area, not mix like in the picture above, looks like a plaincrash imo(IMO )