hi
yes barbs like cucumber - i slice a chunk, microwave it for a few secs just to soften them put an old bit of a corksrew in it to sink it. they also love garden peas (no mint) & romaine lettuce, again i soften the lettuce by pouring boiling water over it & leaving it for 20 mins or so then fix to tank wall with a suction clip thingy, peas(frozen garden ones with no additives) micro for about 10 secs then pop out of shell & mush up & chuk in. they also like courgette (zucchini to aussies & americans) done the same way as cucumber.