gold fish tank mates?

I don't think that this would be a good choice. I had a gold fish (5 inchs long) and a bull head (6 inchs long) I came to check on my fish and my lovely goldfish (her name was delia) was gone, so I got a new gold fish (thinking delia might have been killed by the cat) the new gold fish, Isis, was a little bigger than Delia, I decided that I would use my flip camcorder and tape the tank for the next hour. I came back in an hour and what do you know? Isis was gone! I decided to watch my footage. The image was blurry but I could just make out a dark figure (bull head) chasing another figure (gold fish) until the gold fish stopped swimming and fell to the bottom (I am guessing from exhaustion) and the dark figure went in for the kill and ate Isis's carcass. So the next thing I did was give away the bull head (Zeus) and now i have 3 very happy 4 inch goldfish (Dreamcicle, Creamsicle, and Vanilla)
 
Would it be ok to house a set of gold fish about 4 inches maybe 5 with a 5 or 6 inch long yellow bull headed cat fish?
 
It should be ok, since the goldfish shouldn't fit in the bullheads mouth, and the bullhead shouldn't fit in the goldfish's mouth. I see bullheads in koi ponds all the time.
 
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