I have a Wild Pair of Herichthys Pearsei collection point Rio Zapote Mexico. These Fish are known as Gentle Giants. Kept in my well water of course and feed spirulina and pellets. When I have have duckweed or the likes they eat it with Gusto. This pair is bonded and have laid eggs, however they lost the spawn from the severums. These fish are eay 8"+ $ 125 for the pair. These fish would do well in a 75 or larger. I have 2 pair in a 125 with severums and dithers and this pair is now in a 150 with severums. Young fish ready to spawn and not hard to spawn.
Again click the link Mo Devlin's pictures are awesome.
http://modevlin.zenfolio.com/p103028612