I have some crushed coral sand. Perhaps 60-70lb. It is the old hagen stuff they used to sell. Not as fine as sand, but finer than gravel. It is what I used to have in my Kitumba frontosa tank. It is off white.
featherfin, from lake tanganyika. Cyathopharynx foae - Sibwesa
way before I do South American, I was an African Tanganyika nuts. I was moderating Tanganyika and frontosa section at www.cichlid-forum.com which is one of the biggest cichlid forum in North America. I am still moderating the frontosa section but retire from the tanganyika section.
I have a few of my tang. cichlids photo at my website in the gallery section. Click gallery and scroll them and you can see some of them.