Well, bettas seem to have a problem with rotting food on the bottom of the tank. It harbors bacteria which sometimes causes fin rot (loss of pectorial fins) So I feed banana worms first week (too small to eat BBS). BBS week 2 through 7 and live black worms, daphina & adult brine shrimp, mosquito larva week 8 on. My bettas are ready to breed or show by week 13. You just can't get that kind of growth with food that doesn't wiggle. 
I also use green water, sponge filters and java moss to provide lots of infusoria.

I also use green water, sponge filters and java moss to provide lots of infusoria.
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