I have have raised two from that size to the fat 18" inches they are a little over one year later. Frozen blood worms are great, but the big favorite are red wrigglers (earthworms that are smaller than night crawlers.) They put on good weight with those in comparison to the blood worms, and they really encouraged them to hand feed. I also feed defrosted krill, cocktail shrimp, talapia, etc. cut to a good size. However, a majority of their diet are earthworms, and everyone has graduated to the biggest night crawlers I can find. They took to the red wrigglers quickly, and as they got used to me hand feeding, they started trying anything I'd hold in the tank for them.
G/L with you little guy. They are some of my favorite fish.