I too have never witnessed any cannibalism in my colony. Not near as large as you fellas, I have about 750 or so. I did, however, move them from the cramped 10 gallon to a 20 gallon long tank. And I turned their heat lamp down a bit to slow their breeding .

I do have to say that my American bullfrog LOVES them...they're his favorite . My pacs love them too.