Oh, and thanks for the rotifer info.
I have 4 gallon jugs of about 200 rots/ml each and 20 liters of nanno going and I hope its enough.
I'm going to try hatching the eggs in a 20 gallon tank filled to the 5 gallon mark, and slowly increasing volume if I get a lot of fry. I have heard that having a larger water volume helps the ammonia situation, and the fry do better overall.