Hi and welcome to simply discus. Your discus have been very spoiled feeding on live blood worms. In my opinion you should purchase some Freeze Dried Black Worms. It has really good nutritional value, and doesn't mess up your tank. I have used it together with beef heart, and pellet food to raise juvenile discus to adults and l can't recommend them enough. There are a few places you can purchase it from depending on which part of the world you're from.
If you are from America l would buy them from here. Al is selling the same Freeze dried Black worms that l purchase from Australia.
http://www.aquaticsuppliers.com/Free...d-foods_c2.htm