I've had my tank since january, it's 20 gallons, and yeah freeze dried isn't the funnest, once it's gone I'll get something else, for what it's worth, they gobble it up like it was swimming past them. I keep a good eye on my tank as I'm home most of the time, so rest assured if one of them becomes a problem I'll be on it. Both the betta and gourami ignore the smaller fish, mostly I see them pick at a snail now and then.
I actually have less of a problem with the fish and more of a problem with the cats swatting at them (from outside) or the kids pressing their faces on the tank (despite my telling them not to...kids)