Hey Taras... I hope your fish work out for you. As long as you're happy with them...Anyways, your diet sounds fine. Most of us Discus "people" feed FrozenBloodworms(FBW's) Like anything else, it has to do with which brand you use. Most, including myself feed the Hikari brand. I never had problems with it. Less quality brands...problems. Hikari is worth the extra $$$. A diet of BH will put "shoulders" on your fish the fastest. Brineshrimp being the least nutritious of the foods, but good to keep the fish cleaned out, if they eat it. All the best...Bill