I have to ask even though the subject may have been talked about before here and elsewhere. After doing multiple searches I keep coming up with old search results dating back to 2004-2009. And even those results culminate to arguments, personal preferences, and yada, yada, yada...

I've heard it all; Yeast, fish flakes, mushrooms, dog and cat biscuits crushed up...As of today, 01-25-2013, what is the best, safest, and most nutritional thing to feed a springtail culture that is going to be fed or seeded into a PDF tank?