What Kind OF FIsh?
 

What kinds of fish can I put in with my Koi? :roll:

You said you have a 20G Tank, IE

If that is the case, nothing else. It is too small for the Koi itself.

Ok, your saying that there is not any room for anything else in the 20g with my 6-8 inch baby Koi? He's only a baby...

6-8" is still very large for a 20G tank.

I still would add nothing else until the Koi himself gets a proper home.

My Koi has a new friend.

What is it?

A 55g is big enough for anything. That's still a baby.

You just said you had a 20G tank. Where did the 55 come into the picture?

I hate to sound mean, but you should listen to some of the advice you are given and do what is best for the care of your fish.

And a 55 is not big enough for everything.

If u had a bigger tank i would say to add a large goldfish or 2.

In the proper environment, I would say any large coldwater fish would make good companions for koi. Goldfish and channel cats would probably work well. Of course, this would have to be in a pond of several thousand gallons. It's recommended to have 1000 gallons per adult koi. A 6-8" koi should be in at least a 55g tank, and will need to be in a pond very soon.