I've never fed crickets, my girlfriend will not allow them in the house anyway, "they might escape". However, I've heard people describe them as "crack for fish". Once fed these for awhile, some fish refuse to eat anything else. Hopefully, it's just a little stressed, and will eat other things once it gets comfortable. I think I would lay off the crickets for awhile, and only offer other foods for a few days to see what happens.