You may like it but do the animals? There is no grass for the hippos to graze (cows kept like this would maybe get a visit from the RSPCA) and they seem to spend a lot of time yawning threats at the Mandrills.
I can't imagine the mandrills would ever leave the hippos alone either. They're now in a better exhibit by the entrance, although the house for hippos has no pool, brilliant design