It is pretty amazing! I had a pair of Bangaiis that spawned frequently in my 125 gallon reef. They are cute too -- they look like little versions of their mom and dad.
Now for the bad news. I've done some research on raising baby Bangaiis and it seems like a lot of work. First off, you need to somehow get the babies out of the main tank. Two main reasons for doing this: 1) so they won't get eaten (I don't know what's in your tank, but most likely anything will try to eat your them) and 2) so you can feed them.
The best trick I've found to get them out is with a siphon, the kind you use for water changes. Nets don't work since they can see them and they will quickly hide. Anyway, I would take the siphon and place is near the baby, then slowly lower it on top of the baby and siphon the sucker into a small bucket. It's a rough ride but better than keeping them in the big tank.
On a side note -- if you've only found 1 or 2 babies there's more bad news. From my research I've found that most "litters" contain more than a dozen babies (you can figure out the rest).
So, now that you've separated the babies, you need a tank to put them in. An alternative (what I used to do) is to insert a breeder basket into you main tank and float it in your 125.
Here's the tricky part. You'll need to feed your babies frequently and they usually only eat live food. I've found baby brine shrimp to work, but you can also try anything alive that's small enough for them to eat, like rotifers (did I spell that right?). You'll need to feed them at least 3 times a day to keep them fat and even then, a few babies may die. This will go on for a few weeks until they are big enough to eat adult brine or you can get them to eat other types of food.
To keep this from becoming a novel, I'll close with this -- if you're not planning to set up a breeding station with an extra tank for the babies, brine shrimp hatching containers -- lots of them, and have tons of patience, the only thing you may be able to do is say "aw what a cute widdle bay-bee -- good luck in this cruel underwater world."
Sorry to put a sour spin on your happy occasion. Let me know how it goes.
D-Nak