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Hi omega59
I don't think any of those vegetables should hurt your fish. Of course, you will not want to leave it in there long enough to spoil and pollute the water.
Why not try adding a piece during the evening and leaving it there overnight. You should have attracted some snails by morning so you could net it (with the snails) out. The following evening you could put in another slice.
Yeah i give zucchini/cucumber to my BN plec, and I have those little brown pond snails in my tank and they don't go near it. I don't know what else would work other than picking out the visible ones at water changes and watching your feeding to keep the numbers down. Once you've got them they're virtually impossible to get rid of unless you nuke your tank...good luck!