I also had bad experience with F1 or F2 Thorichthys areum which I lost about a dozen of them in two different rounds to bloat and bacterial infection. Now I have none left. I kept them in an African tank with pH 7.4, GH 12 and temperature 76F. These are the water parameters Thorichghys species came from and theorectically the right water chemistry. I didn't feed them special vegetative diet, only general cihlid pellets high in protein . Most of the African cichlid tankmates are the peaceful type like peacock and Haps and the Throichthys were never bothered. But the fish load, like most African tanks I have, are on the high side. It turned out that Thorichtys species are more suseptable to bloat than Africans which I always thought the other way around was true. I think the newness of their domestication is the reason for their sensitivity the same way Africans were when they were newly introduced.