When I kept Tropheus I used to cycle rocks between their tank and a small container pond I kept outside with some African Butterflys. The algae that grew on the rocks is the natural food of Mbuna as well. Tropheus are MUCH nore susceptible to bloat than Mbuna ime, and I found that if I relied too heavily on spirulina flakes a fish would bloat now and then. I can't imagine giving beefheart to one!