I've had real good luck raising fry BUT it was within my own systems so the water was at least "similar". Unless you are lucky or have a lot of experience with it I'd recommend at least waiting until their "free swimming" (lose the egg sack totally and swimming about the tank like any other fish ... just scared as heck!! ****

) In my fry tanks I have a bright light ****(65 watt cf on a 20L tank) that grows a ton of algae and java moss with a few other misc. plants that helps them feel "safe" as well as the algae providing very nutritious (FREE!) food for the youngins.
too many variable when adding fry that young to a totally new ecosystem ... it's hard enough on a sub-adult with the temp -ph-kh-ni-na changes from their system to yours much less a 3 week old fry that can't even stay off the bottom for more than 20 min at a time without resting ****
good luck
l8ter ****