So I've embarked on a new mission, hydroponic greens. I've been reading a lot about it and decided to give it a try. Set up my own diy system and I've got 6 butter crunch lettuce sprouts started. If it's successful the goal is to be able to grow a head of lettuce to pick and throw in each tortoise pen once a week. I'm thinking about using the water from my pond to feed them instead of artificial nutrients, like aquaponics sort of. Does anybody know if their would be any risk of cross contamination if I feed lettuce to my tortoises that was grown with water from the pond that has turtles in it? Or risk of salmonella if I eat the lettuce?