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I had been told before to purchase these in even numbers (pairs) but today a the LFS I was told they should be purchased in odd numbers. Which is correct?
Either, doesn't matter. You'll have a dominant female, a dominant male, and however many subordinants you want. At least that's the way it works with false percs.
There are rules like these where there are exceptions. IE. Tang school counts. One or three (more than that can be odd or even), not two or they wont have a third party to keep the two from killing each other. This is contradicted by one of our members who has two regals that get along just great.
But as Quary said, 2 would definitely cut down on politics. But in your 525g... um, I'd say you're not so limited.
There were 4 in the tank and they were obviously paired by the way they swam together. I told the lady I would take all four and I got the shock look and "you do not want to do that" And said I should only get 3. I argued a little and the other attendant agreed with her. My thought was less sell for them so they must know something. I wish I would have gotten all 4. I may go back tomorrow and get the other one. PS they had a nice sailfin they tried to sell me.