Baby axolotls floating

[kirby the axolotl]

I noticed My 3/5 of my new axolotls were floating. Yesterday, after I fed them they started to float. I did a 100% water change and lowered the water in the little plastic containers. I feed them twice a day and started to feed them once a day and each time I feed them I do a 100% change after. I feed them frozen bloodworms and sometimes baby brine shrimp. I feed them by sticking a dropper under the water and squeezing the bbs or bloodworms out. I used to feed them by dropping them above the water and I just changed to the underwater method today because I noticed they might have eaten some air when they dive at the food. Also, are there any mufflers for air stones? One axolotl keeps swimming away from his. That axolotls are roughly 1 month old.

 

[GulfCoastAxolotls]

Couple questions for you:
what temperature is your water?
How much are you feeding them at a time?

Baby axolotls do tend to gulp more air and float when they are not getting enough to eat. Higher water temperature can also cause floating.

 

[kirby the axolotl]

Water temp 68.7 (i think the babies like the water warmer)
I feed them about 1/3-1/4 of a cube for all of them