veggie formula

I recently started a 55 gallon cichlid tank and have 14 fishes (8 2-inch mbunas, 4 2-3 inch haps, 1 pleco, 1 small green terror). Is the tank overstocked or can i add few more fishes? I bought Northfin cichlid formula, veggie formula, and krill gold formula (i heard a lot of good reviews of...