I went to clean my dubia tank the other day and noticed that a couple of males have been eaten by other males. I read in another post that you need to add protien to their diet or they will resort to Cannibalism. Right now I feed them collard greens, carrots and romane lettuce. I also throw in some flukers dry cricket feed. What kinds of cheap sources of protein can I throw in there so they will stop eating eachother?