Hi, I'm wondering what amount of a complete food compared with eg cooked fish a cat should have in a day to get a balanced diet? Half and half? or would one third complete cat food in a day be ok?

He won't eat raw (and I don't want to try and convert him at the moment as he's not been with me long).

He's had an occassional runny tummy as I've tried to cut his dry food down. He does well on cooked 100% coley portions (white fish) which I can get for a good price too. He can be a bit finicky about his wet food - maybe I'm spoiling him! He has occassional bit of chicken too.