I'm setting up a 55 gallon south american biotope tank specifically for geophagus. Right now I have a 20 H with: Satanoperca leucosticta (Geophagus jurupari), 2 Satanoperca 'surinamensis’ /Geophagus surinamensis,
a pair of smal angels, a Brochis (giant cory cat), weather loach,
2 Kuhlii loaches,Synodontis decorum, So. American Bumblebee Cat), and a Peruvian Redtail Barracuda. It's prtty heavily stocked but it's well established and I haven;t had a problem with compatibility so far. I'm thinking of adding :Geophagus sp. ‘Redhead Tapajos’ pair, Gymnogeophagus balzani (Uruguay)-male or pair, and 1 Panaque suttoni (Blue-Eyed Pleco). Anyone foresee any problems with this mix? size isn't a huge deal because if things get too big I can always bring them into the pet store I work at and trade them or something smaller.