I'm unsure as to how to turn on my e-mail, I'll look into it. It'll take me a while I'm sure as I'm almost computer illiterate. Anyways my e-mail address is firstname.lastname@example.org
To answer your question about fish eating each other, if a fish can fit another one in his mouth he'll eat it. If another fish is weak or stressed the others will kill it, and pick away at it when it's dead or dying.