are you useing capsulated or decapsulated brine.
here are the Optimum Perams for Hatching
Temperature 25-28°C (77-82°F) For hatching
Salinity 30-35 ppt
Ph 8.2 (<8.0 or >9.0 will result in death)
Light 24 hour bright light for hatching (50-100 lux)
O2 Levels > 4 ppm for hatching
here ar the Optimum Levels for On-growing:
Temperature 22-26°C (72-78°F) For on-growing
Salinity 30-35 ppt
Ph 8.2 (<8.0 or >9.0 will result in death)
Light dimmed light is recommended (< 50 lux)
O2 Levels > 2 ppm for on-growing
here is some reading for ya about hatching taiseing and feeding brine.
here
HTH
Mike