I've had my ACFs for a little over a year now (someone on craigslist was giving away tadpoles and I raised them up), and I'd like to give them more variety in their diet.
Is there a list of safe foods to feed, or anything anyone would recommend. I'm currently offering them frog and tortoise pellets, blood worms, earth worms and occasionally phoenix worms.
Are there any other staple foods? Are guppies a good staple?

Thanks!!

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Oh yeah, I also don't use any substrate at the moment, is that a problem, or is it more of an aesthetics kind of thing? I had been using small pebbles but 1) they got to big and could possibly ingest them and 2) the didn't seem to be able to find their food well on the rocks so I had to keep a plate in with them and drop the food on that.