Can keep cudas but will need to go with larger tetras like some Africans tetras. clown loaches will be a good option. Ornate pimelodus will be another good option. Great school and active. Jeff rapps get ornates on his stock list much more frequent than other importers. Large sized ones would be the best.Thanks for all the help. At this point I'm thinking a group of pims or clown loaches for bottom dwellers. I'm still interested in a school of tetras of some sort but am floating around the idea of a group of acestros, which would rule out the possibility of any tetras in the tank.