I have 4 baby T. s. sirtalis. One still hasn't eaten and the others have only eaten once but they are just over a week old. I am setting up a tank to keep guppies in and I want to treat the water with some anti-parasite medication. Would it be bad for the garters to eat fish that are medicated? One of the fish had a tumor like thing and another just died randomly. I just really don't want my snakes to get any parasites from the fish but I also don't want to feed them fish that are going to make them sick.