Thanks everything if read about them says the opposite, that you can’t keep more than a bonded pair.
Not to hijack too much in what's an awesome build thread, but -
Most of what we read about with regards to fish husbandry is built around best practices and smaller tanks that a more typical aquarist is likely to experience. Most rules like that can be amended or expanded in a larger tank. For example, in most tanks, you definitely wouldn't want a puffer or a parrotfish in a reef tank. But if you had a large enough tank with strong enough SPS growth, you could totally have some of those fish in a reef tank. Most of us will never have a tank that will allow us to break these "rules" of fishkeeping, and so for most of us rules like "Don't keep more than one firefish in a tank," hold true. But if you're ever in a position to drop a big fat chunk of change on an enormous tank, you might be surprised what you can get away with.