Since you seem to post a little about axies go check out Axolotls: The Fascinating Mexican Axolotl and the Tiger Salamander
It's the most amazingly informative site, but everything is copy righted so I can't post the info directly lol Lots of aussies on there too
Baby Brine shrimp will be perfect and should be enough They will/should only eat live food. Make sure you clean up any left over dead ones before they make the water icky. Sensitive little darlings they are.