LKG, have you considered getting rid of all those little QT's and getting a legitimate QT? IME, a 55gal is perfect, it's large enough that is suitable enough to house larger fish, that Hippo will be delighted to be in there instead of the 29gal, and able to keep multiple fish in QT. Yet it's not that big, 10gal water changes still affect parameters, and the tank itself is pretty cheap. I think they can be had at Wal-Mart for $70? If the filters are already cycled for the 29gal and 10gal, those are all you need, and the heaters from those tanks should work as well.