I have a royal pleco in my tank and he tears up the cucumber at night, not so much the inside but the outside is all gone in the morning and its not the hifin eating the outside. He's grown about 2" in the past 4 months, I do not blanch mine I leave it raw and use a stainless steal fork in it to hold it down in the gravel. I think he gets mad at me when I dont put it in for him at night. it will just take a little bit but after they get used to it being there they will be out as soon as they think your not looking lol. Neither of them like the zucchini they leave it pretty much untouched. They also like the watermelon too, a little pink on the rind and they tear it up.