So I think fish must have taste buds, at least my aristochromis christyi and syno hybrids. When I put flake in, the aristo go for it with gusto and the syno's ignore it. With NLS pellets, the syno's come out and vacuum the gravel like crazy, but the aristo's don't want it.
Though that was funny. Everyone is growing well, so they must get enough, even when they seem to skip a feeding.