Hi everyone im kinda curious on what everyone would think of my discus diet. First I have 5 discus in a 75 gallon.in the morning i give them hikari discus bio gold pellets. Then when I get off from work I give omega one cichlid flakes and 2 cubes of frozen food which i change it up everyday between bloodworms,spirulina brine shrimp, beefheart,krill,mysis shrimp , and daphnia. Anyone think I should add or remove anything from their diet?also I do a 20 gallon water change every week is that enough or should I do more?