I tried it too in the hopes I'd find a second food for my CBB (I really really worry when a fish's diet is so monochromatic .. mysis good or not, variety as to be a little better... plus, although it could be coincidence, all the fish I've ever cared for that did exclusively eat mysis (cardinals, dragonets, mandarins) all had much shorter lifespans than the fish who would eat a variety of stuff.) Anyhow, my fish still didn't really think much of the bananas. Chased it down, swallowed it, spat it out.
Guess they either love it or they don't. Bummer.