Picky Shrimp?...

So currently, there are 2 tanks with various shrimp types / colors (Amano / Neo ~ Red / Orange / Yellow). I just got a small / trial box of those lollies and have begun trying to see which flavor is preferred. In the community tank with mixed species / colors, the sticks are cleaned up in hours. In the 5.5 gal that Currently has Blue Dream / Green Jade, a couple (tiny) horned Nerites, and who knows how many (unwanted) bladders, the stick is mostly ignored save for a couple shrimp and a handful of the pest snails (luckily not swarming).

Has anyone else seen where some species / color variants don't seem to like the lollies?