Here is a thing not many people may know (but you lot are probably going to prove me wrong!)so you are sayiong rays have not learned how to deal with cooked foods
my rays was born in my tank and most of them are 6-7 years old i wonder how long it takes them to get used to it then
when you change a dog from one dry food to another it doesnt take 7 years it takes a few days
rays can handle sea foods yes we know that
we also know that to much salt is bad
so by feeding a fw fish just uncooked shrimp salt water foods its daily salt intake is way to high to be healthy
cooked salt water foods has less salt in it
i never had the need to added silly vitamin dust to my rays food i just feed pellet and frozen prawn as a filler which fills the rays up
i think the big multi million $$$$$ companys like hikari and NLS have spent a lot of $$$$$ to get there mix of food right before putting it on to the market dont you
they even brake down whats in the pellets whats the brake down of whats in 1 shrimp i bet you dont have a clue
I work with a guy who used to work for Mars/Cadburys. Many years ago they used to make dog food and this guys job back in the day was to come up with ways to get revenue from the process waste left from making the dog food. They came up with a way of spraying the waste onto big screens, adding colouring and vitimans etc. This is sold today as Aquarian Tropical fish flake food!