You want to food thawed before you feed it, using rodi
water is just clean water. Rinsing the food with rodi
prior to feeding will remove the juices from the food and will not contaminate the tank as it would if you used straight tap water. You could use tank water also just make sure you rinse the food well and dispose of the juices. What I do is thaw the food then I use a tiny strainer over a spare bucket and squirt rodi
water into the strainer to wash away all the bad stuff. Once that's done I feed then dump the bucket with juice water down the drain.