I had originally planned on separating a side of my brothers koi pond for a larger Midas but I don't think he'll be up for that. What I am considering is perhaps throwing a smaller Midas of about 4"-5" into the pond and seeing if he could co-exist with 14"-20" Koi's. Koi's are very powerful so I think they can put the Midas in check really quick if need be..... do you think he would reek havic when he gets some size or will he learn to live with the larger Kois?