Since many of the Malawi sift through the substrate to find food, is there a food that I can add to meet that need, something that settles into the substrate. I guess they are looking for crustaceans? My regular food is Cobalt spirulina flakes and NLS cichlids formula. Everyone seems to be doing fine. I do give them a weekly frozen shrimp treat and every couple days I throw in some Bug Bites. I kind of get the sense to not start with snails.