I boil my Zucchini until it is soft. You may want to try a variety of veggies, I feed peas, broccoli, carrot, zucchini, yellow squash, and romaine lettuce regularly. You can either cut it into bite-sized pieces or get a veggie clip and let the fish graze on it. Don't give up if your fish doesn't like a certain veggie, all fish have different tastes so try a variety.