All commercially grown tilapia have the same basic needs. Young ones need higher protien than large one ones. About 40% protein is good for the little guys and it ramps down to about 28% for adults. Little guys eat much more % of body weight than addults.

SRAC has a good set of papers on tilapia. Check:
https://srac.tamu.edu/index.cfm/event/C ... tegory/11/

Download the PDF's and keep them for reference. I learn something new every time I go through them.