I had a pair of mated perculas. *had* being to operative word because my maroon killed both. My maroon got along with a single percula for a long time although they had different ends of a 110g tank. Apparently, a mating pair was too much for the maroon.
You could be lucky to mix different species or more then a mated pair of the same species, but it could also end up in disaster even after things appear to be fine for several months. I can't recommend it unless you have a large >200g tank and even then I'd be very cautious.
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"We are what we repeatedly do. Excellence, then, is not an act, but a habit." -- Aristotle
Current Tank Info: 110 gallon reef, 100 gallon SW
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