"The most economical feed for me was the spirulina but BSD's Tahitian Blend makes things so easy, albeit at a greater cost. I have used rice bran powder, pea powder, and a few other things from the bulk barn, but the spirulina worked best of all those things but not as convenient as the TB."
From an outside source.
Also you can feed them ground wheat germ in addition to the algae and veggie based foods to boost protein content.