broccoli, courgette, cucumber, peas occassionally, plenty or other stuff aswell. just dont leave it in more than a day or so. i tend to put some in between midday and evening, then take it out in the morning. not usually much left by then. you'll need something to weigh it down with probably. i use the little plastic things you screw in the end of corn cobs. also im pretty sure clown plecs REQUIRE bogwood (not mopani, too hard) to eat.