I have A LOT of Koi Fish (About 20) and they are all healthy. I feed them and keep the tank clean and everything. But whenever I put my hands in the water they always swim to my hand for me to touch them. I am scared to do this, as I have been reading and it said that it can rub slime off. But I was wondering if this was the same for Koi Fish? Because my Cousin has a few Koi Fish, and she touches them all the time. They don't get sick or die.The only time they die is if they jump out of the un-used swimming pool she has them in. Is it safe to keep them outside in a swimming-pool? (The pool is very large) So those are my questions. Thanks for reading!