For food, I do you cyclopeeze, dts phyto and dts oyster eggs. Right now, I like to use a product by Sweetwater called Zooplankton. Seems like everyone gets plenty to eat with this stuff. The only "secret" that works for the majority of us is keep the water parameters good (including keeping your temp stable, ca and alk and ph in the right range,...) , don't overfeed, make sure all equipment is working properly, ...
I don't think their is a secret additive on the market. Don't get caught up in the claims a lot of products are making (I did on a few).