Sounds like you're off to a great start! Can I get in line for the babies!? haha
Hehe, absolutely, but I don't know how long it'll be before I have some actually survive long enough.
So there is nothing else to the hatching tank except the heater and airstone? No other flow or filtration? Do you just have to do water changes or something? My guess is that is because you do not want to filter out the babies or rotifers - is that correct? How are things going?
Sorry for the bombardment of questions - it is just very interesting and I plan on following you along the way and possibly doing the same thing one day just for the experience. I raised some bangaiis awhile back and it was a very rewarding experience. Keep it up!
I don't mind the questions!

Other than the heater and airstone, I have a thermometer and an ammonia alert badge, that's all! Once(if) the babies pass through meta phase, I'll add a sponge filter to help with filtration. Right now, yes, water changes and siphoning the muck off the bottom are key. I'm doing daily water changes, unless more are needed and I drip the fresh saltwater back into the tank slowly so not to shock them with the difference in water params.
Well, good and bad news.
Bad news: Most of the larvae have died. Water params are ok, and I'm about to do another water change/bottom siphoning after which I'll drip the new SW into the tank slowly.
Good news: There are still between 100 and 150 live ones and they are eating well. I've even noticed some tail curling and lunging!
I'm worried that there might be too much water movement and maybe the little guys are just exghausting themselves to death. I'm going to switch to a smaller airstone and if need be I'll go and buy a smaller air pump, though I'm using the smallest whisper pump right now.
Anyways, I'm not too bummed because I didn't expect to have any still living today, lol.