i have never tried cucumber, but my lettice went funny in about a day! i am happy with pea's tho, my plec loves them! had him about 3 days, lettice for 1st day, didnt touch that, pellets second day, didnt touch that, some pea's 3rd day just left on ground, didnt touch that, but this mornign i put a pea in my fingers slowly moved towards him and he started to eat the pea, and now is not scared of me so i put my hand in the tank and he comes straight over to me and sucks my hands hope this helps?I'm going to give my pleco some cucumber, how long can I leave it in the water for??
Not more than 24 hours.