Bullhead Catfish With Koi?

I never try these combinations due to the many stories I have heard of the "peaceful" aggressor one day waking up and destroying the other fish. One story I've told on here is how a guy kept a pleco with a pirahana. The piranaha just sat and watched it clean the glass and everything. Then one day, he came home to half a pleco.
Yes, fish can live in odd combinations that aren't supposed to work sometimes. But usually it turns out that they actually can't when one day someone gets seriously injured or one fish suddenly turns into a bully. The cat isn't settled down yet, in a couple of weeks it will be.
 
I have a bullhead cat in my 55gal with albino tetras,angel's,pleco's and 2 rescued gold fish.The bullhead just sit's in the same place until feeding time.I haven't had a problem.the bullhead was in my 100gal until my flowerhorn decided to pick on him so i put him in the 55,but be warned just because it work's for me doesn't mean it will for you.GOOD LUCK IF YOU PUT THEM TOGETHER.
 
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