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It could go either way, how territorial are you 4"s now? I know that I have 4 at 4" and if I would add another that they would destroy him almost no matter the size. They have precise rankings in my tank. I wouldn't recommend adding 2" Ps to that tank. Now maybe if it were a new tank that none of the fish had established territories. My advice you tank is pretty much at its limit now, and I wouldnt risk wasting your new Ps. Just be patient and wait for a larger tank then it would be safe to add some smaller ones.
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