Can sand dwellers like xenos or callochromis be kept with altos? I'm looking for ideas since my tropheus tank idea had to be scratched. Tanks a 75 with only 3 1.5 inch comps and 2 2 inch synodontis multi crosses in it. I'm adding a species of cyp once I decide on which one to get, and I'm thinking gobies but they're another species I'm unsure of. Any input would be great.