Thanks for covering down gunny reefer and semper. I have to admit that i havent looked at this thread in quite a while, didnt realize there were new comments. As gunny mentioned, my original attempt was using a flash light to draw the newly hatched fry to the tank surface and then collecting them with a plastic deli cup.
While that approach worked, i definitely wasnt able to catch as many as i would have liked and took quite a bit of effort/time. (If your tank lighting schedule is set like mine, lights out usually means you should be in bed sleeping and hatch always seems to happen on a week night meaning its going to be a long day at work lol). I personally believe having a dedicated tank for the breeding pair with a tile or pot for them to lay on is best. You can pull the pot or tile and put it in another tank by itself to hatch thus having all the fry contained already.
Rotifers are pretty straight forward to culture. First youll need to buy some rots, i think L type are the most commonly used. There are various places to buy but reed mariculture is a great place to start. Besides that you'll need phytoplankton to feed the rots( which can be live or a concentrate such as rgcomplete which i would recommend, a 5g bucket, air pump, airline, rotifer sieve, and some airline tubing. The phyto food is the most expensive part but otherwise its straight forward and pretty easy. Fill the bucket with salinity appropriate water, add some phyto to tint the water a slight green, put a lid on it and run some airline tube into the bucket to lightly bubble the water( if you get any foaming action at the top of the water your need to turn down the air) The main requirement for rotifers is to ensure that you are keeping the rotifer water green and also harvesting a small amount of them each day once your culture is up and running otherwise youll risk the culture cashing due them overpopulating.
Sorry the long winded response and happy breeding! Its a very rewarding pursuit.