My Betta fish are fussy eaters. Who knows why, but I must have the worlds fussiest individuals. I've tried all sorts, and eventually realised that I need to be giving them breed specific food, or, Hikari Tropical Gold.
It went down a treat, and, at under four pounds, the price was cheaper than my local retailer who charges nearly five pounds for something similar.
Unfortunately, this does not last as long as it should do for the money it costs. I guess that's down to varying factors.
All in all. A worthy purchase :)