I'm just starting out and have done a lot of research and cannot find a reason as to why springtails cannot be used as a primary food source. All I ever see is a statement that it shouldn't be done. I undertsand that a PDF should have a varied diet, so why couldn't you have sprintails as the main course and fruit flies as the side dish? I'd like to do springtails instead because they seem easier to keep, not very smelly, can keep cultures directly in the viv and reproduce quickly. I'm planning on keeping leucs, by the way. I guess if they are too small you would have to feed a lot of them to keep the frogs healthy, is this the only reason? Thanks.