hmmm, ive never tried feeding zucchini. shelles peas seen much easier as they sink slowly to the bottom. my rams mouth almost turns green from eating so many!
I slice it up, add some plant weights and throw them in the freezer. The freezing bursts some of the cell walls in the cucumber/courgette(zucchini) which has a similar effect as blanching, making it a bit softer for the fish. This makes it nice and easy to just pull a slice out and drop it in the tank.