hey! they are a smaller cichlid from lake tanganica and 38 gal sound like a grate setup for a singal specis tank with a good colony, they are very agresive and but the cool thing is that junger generation will look after each othere sand is a most for this guys and shell dont do to much aranging they will tear everythig up and do what they want with the rocks shells and sand. also water hardess and ph has to be high if you want them to breed and color up nice well let me know how it goes ok.