Not much of an issue in my view now , but note that the fishes eye's appear large,
Several small feeding's each day ,will help the young fish to grow,develop, to point where eye's appear small rather than ;large which indicate stunted growth.
Blood worm's although enjoyed by most fishes, are largely water/moisture by content,(little nutritional value) and considering where these are gathered from,,may increase the possibility of intestinal parasites.(opinion's vary)
Would stay with good quality flake food with higher protein % like Ocean nutrition while fish are quite small, and get fish started on quality pellet' food as soon as possible.
The Discus I kept were fond on Tetra bit's,New life spectrum,spirulina pellet, Brine shrimp, Ocean nutrition flake .
Once the fish grew larger,,I used larger pellet food's, along with bit's of frozen krill,chopped earthworm's,meal worm's,Freezedried Cricket's (Fluker's).
I did not offer Beef heart,and only served the blood worm's as treat maybe once a week, and soon ceased with the blood worm's altogether due to issues with Angel fish ,and the Discus which I admittedly speculated,, that the blood worm's were contributer's.