It is one of the certain types of frontosa but at a smll size like yours it is hard to tell. It can even be hard to tell what type you have when they are bigger as well. One of the most common types of fronts is the burundi.
Some types get more blue than others, so it is hard to say how to get the most blue, other than feed it a good varied diet and do regular water changes.
What I fed my fronts when I had them was O.S.I cichlid pellets, New Life Spectrum cichlid formula, and gave frozen krill 4 times a week and I got pretty good results with mine. If yours is to small to eat krill then I would try mysis shrimp.
Ash, why do you say to make sure and feed it a veggie diet. Fronts arent vegitarians or fish that feed heavily on vegitable matter. In the wild you wouldn't think so but fronts are actually preditors. One thing that fronts eat the most in the wild are cyprichromis. I read somewhere that at night when the cyprichromis are sleeping the fronts will go around and make easy work of them. They feed at night cause during the day there is no way a front could catch a cyprichromis. Esspecially in open water.