Greetings MFK stingray keepers. I have 3 rays orb, moto,and retic. All are saucer size and I have been feeding European nights, river shrimp and fish. I ran across an ad about leeches while searching for wholesale worm dealers. They are cheap easy to maintain and full of protein. My concern is should I kill the leeches prior to feeding? I plan to start them on medium leeches about 3inch. What say you on leeches as prey for stingrays???