yea theyre kool to watch develope from eggs ae
did they all die quickly, a week old isnt long and if all died thats sorta extreme as with no attention id expect a few to survive, im leaning towards water prob, maybe over fed with brineshrimp as they shouldnt nd to much live food in first wk and tht polluted water . .
daphnia's like gold, try get it established with eggs before they hatch and as they eat it/dissapears add more, possibly try microworms once the egg sak things gone (about a day old for memory?) but daphnias great (keepting a good supply is the tricky bit) im surprised your axie babys didnt start eating it, maybe you have to much water flow in tank for them to settle?