yes plecos(depending ont eh species) and SAE will eat cucmbers. I also feed my bristlenose pleco and SAE zuchini,carrots(I freeze them first so they are soften, The pleco eats this not so much the SAE), swiss chard, peas(shell taken off). BAsically any veggie you have you can try. I have heard of people on the planetcatfish.com forum feeding yams to their plecos.