One of the most essential things when trying to raise marine fish is what to feed the larvae and fry.

Rotifiers are a great first food for a lot of marine larvae and an example of how to culture them can be found in the link below.

http://www.advancedaquarist.com/issu...02/breeder.htm

Pyhtoplankton is usually needed to feed and enrich rotifiers so below is a link on culturing "phyto"

http://www.advancedaquarist.com/issu...02/breeder.htm