electric blues are slow growers in general so even if you fed it very well your going to need much more to get alot of noticeable growth in a shorter period of time... meaning- there is more than just feedings that contribute to fish growth.
1. tanks size- bigger the tank-better for the fish
2. water quality-alot of filtration (mechanical and biological) plus alot of water changes.
these 2 are the biggest, next would come feeding, feed a food rich in protein 2-3 times a day (not alot in each serving). this is called powerfeeding it's been known as a good way to gain fish growth in a small amount of time (but does not give the fish much time to grow into great colors or features, so i personally don't like the idea of it.