Thanks Pete for your usual in-depth analysis! I did the fresh water dip. And did see a number of whitish specks in the bottom of the container. I like your suggestion about gut loading brine shrimp and adding them to fresh water. I have never done that. I have vita chem on hand, but where do I get selenium tablets? Also, in terms of formalin, none of the pet sites I frequent have it available for purchase. What I do see on Amazon is 37% formalin. Is that the same thing I used to purchase from pet sites a few years ago?