If you love your cats don't feed them tuna. It is not their natural diet and has caused numerous health problems for cats that I have had in the past. A lot of tuna based cat food is really bad for cats. I am not sure if the human consumption tuna is any better.
Ever see a cat catch a tuna?

Your cats sound cool. I love both cats and dogs but when you get to know a cat up close it is real cool. They can be affectionate but also very independant. They are mini versions of the big cats.