I have a pair of Black Ice clowns that have been breeding every 10-11 day like clock work for the last 2 months. I have been able to raise around 150 so far but having troubles with them dying in 12-48 hr period. Once I get past 72 hrs (3-days) I hardly every loose even one. I have made the mistakes of not enough rotifers and also too many rotifers in the fry tank. I get 99% hatch rate the night they hatch. Usually 200-300 fry swimming the next morning. I'm getting it down to what I estate around 15 rotifers per ml. My question now is on tank size, airflow, and rot density. I'm using a 5 gal tank and start around 3 gal at 1.025 sg. I lower it to 1.020 during the first 24 hrs with a drip. I have been using a rigid air line about 2-3 bubbles per second and it seem to not turn the water enough. What I see is a dense later of rotifers in the bottom 2" of the tank. So today, I tried a air-stone with more airflow to mix them better and help with oxygen. You that are breeding clownfish and getting 200-300+ thru meta per batch....what are you doing with airflow, rot density, and tank size?