Cyrus do you make your own beefheart or is it premade?
The krill and brine shrimp should help with the issue not cause it.If you have your fish taking krill, I would feed more of and less of the pellets.Discus can be picky with krill but its a solid nutrional powerhouse food.
If the beefheart is pre made /commercially made ..Id avoid it. Theres no control.on whats in it unless you really trust the vendor.Better to make your own .Gives you more control over the ingredients.
Its not good if you have to treat for blockage and use antibiotics like that regularly.It sets you up for a serious infection of some drug resistent.
al