Its hard eh? When the store gets in big fish I just have to frown because there are so few aquariums out there that can properly house them. When we get our new house we are going to do a large in-wall acrylic FO tank, and give homes to big fish.
I will be the Fish Whisperer.
I agree I would sooner part with the Hippo... Tusks are just too cool. Maybe some sort of ugly tank divider if the chasing gets outta control? Or give the Hippo a time out in a small tank. He will eventually learn his lesson. :P
I'll keep you in mind either way.
-Diana