hi i have 40 baby axolotls i have been feeding on fresh hatch brine shrimp. They are two and a half weeks old .Started run out of brine shrimp eggs got some more but there not hatching. Is there anything else i could feed them till i get some more of the same ones .How long will they last without feeding ordered some more they should be here tomorow .Witch means they wont have fed for three days any help please