Boy, you are sure in the thick of it. I have just got through all this so I know how you are feeling.
My babies are a month old today. 40mm long, with tiny little front legs and little buds on the back.
I bought Brine Shrimp eggs from fishmark72 (michael@reefculture.com.au) on eBay, and they are really good. I first bought 20g for $11.50 and I have just ordered 40g of decapsulated eggs for $16.50. Postage is express and costs about $4.50. I can have bbs in 12 hours if I need them. I use the coke bottle method, I use the red saxa table salt which does not have iodine in it. I have not heard of putting baking powder in. I start off with warm water, and the light bulb I use is a 100 watt. It keeps the water warm all day and night. I use 1 litre of warm water, 1 teaspoon of salt and about 1/4 teaspon of eggs. Now that would easily feed about 50 or more babies. Warning : when you take the airline off the air, peg it to the top of the bottle or something. I have wasted a couple of feeds through the line dropping down and the bbs ending up all over the floor. Two coke bottles sure is a good thing.
Of my 61 hatchlings, I ended up with 39 after a few floated with bubbles in the stomach, a few just were floating round on their sides and looking very pale, a few ended up headless so I guess they were good food. And I think I squashed a couple with the little plastic jug I used to put food in and scoop out water for changing.
So, I had three bowls with 13 in each, kind of sorted according to size. The biggest ones, about 25mm long, were easy to pick up with my tiny net to transfer into the clean water bowl, but the others were so difficult, and I didn't want to squash any more with the net, so I cleverly decided to gently pour the water and babies into the net! Hey presto, 26 very stressed and quickly deceased babies. Their tails curled up like little seahorses, and their gills did the same. Anyway, mother nature took her revenge on me, so I fed them to the goldfish. I was not sure the fish would eat dead ones, but now they are all fat and happy.
I have not been able to get live food, as a large wholesale supplier has just gone into receivership here in Aus, and one of my local pet shop owners has bred axies on and off for years, so if he can't get food I figure I won't find any for a while. So I bought some frozen bloodworms, and I chop it finely, kind of grating it with the sharp knife while it is still frozen. This gives me really tiny bits which I float in water then pour in a minute or so before I put the bbs in. The babies dart round a lot, so the worm bits look alive, and they are happily eating them.
I have been doing this for a week, and this weekend I am getting more bowls and putting maybe two or three in a bowl as some of their tiny feet are being nipped off. They race round and bump into each other all the time so it is no surprise that happens. I will keep up with the brine shrimp for a while, and every day I read stuff here and on axlotl.org, so when it is time, I will start them on soft pellets, I think.
I would be happy to chat on the phone, and I have free landline calls. Tuesday night, Wednedsay mornings, all day Friday, Friday night and Saturday are good for me. I will pm you with my mobile and home number - just txt me if you like and we can tee up a time.
Cheers, and good luck
Lu