Personally, I would not do it. I bought a bonded pair from Diver's Den over a year ago. At first, they were fine together, but after a short time, the larger Helfrichi started to harass the other. Eventually, the smaller Helfrichi passed away. I still have the lone Helfrichi, and he is always out in the open with the other fish. They are one of favorites, but IMO, it is better to stay with one.