Giorgos,
We are in agreement. As I mentioned, I have been going to begin experimenting with incorporating much more fruit in the form of dried cranberries and perhaps some blueberries in a few experimental beef heart blends. Beef heart blends are so easy to vary the recipe and I don't use as much heart as many people do. It's just that it is a good vehicle to deliver and disguise new foods that contributes to my use of it. Still, as a percent of their overall diet, beef heart makes up a small portion of my Heckels overall diet. It may prove that a blend consisting of only 20% heart and the rest the vegetable matter, FD Blood worms and earthworm flakes or perhaps the earthworm sticks folding in after blending the heart, CyclopEeze, Spirulina and vitamins would be added during the initial blending of the heart.
At least that's my plan. I'll probably try some banana, too. It might be necessary to add a lot of Ascorbic acid(Vitamin C) to reduce the oxidizing of the banana. Probably dried banana would be the best form to use as a component of a blend.