Hello, so we have had these 6 discus (young) for about 2 months now and they are awesome. However, they seem to always be hungry! I feed them once in the morning around 9, then when i get home around 6 and sometimes before they go to bed around 10. Each feeding is a block of frozen brine shrimp, red or white mosquito larvae, or beef heart. Just after I feed them they are looking at me as if they are still hungry. These are the only fish in the tank (other than the pleco and a bunch of shrimp/snails). Am I feeding them enough? Thanks!