I have a pitbull pleco, and he loves zucchini! I get a small zucchini and cut it about the size of a quarter, then cut that in half (he's very small -- you could give a little more if your pleco is big or you have more than one). I use a long pair of tweezers and wedge the zucchini into the gravel. Or you could use a rubberband to attach it to a rock or other decoration. A veggie clip could be used also -- it's a clip with a suction cup on it; you stick it on the tank wall. I have also read that people use one of those ceramic noodle filter media. They tie or pierce the food with a fishing line and string the noodle through, which sinks the food. Leave a piece of the line sticking out of the tank and you can easily pull it up later.