I kept two pairs in a 90g. A pair of false percs and a pair of tomato clowns. The tomato clown pair was slightly larger then the false perc clown pair and he would chase them quite a bit. Downright attack them if they came near his anemone.
I have not had a maroon, but everything that I have heard and seen in fish shops is they are very aggressive and much larger then false percs. IMO a 4' tank is not enough space to seperate them. They do not have enough buffer zone to move away. A maroon clown will probably chase any fish out of his territory if he can do so.
Goodluck I hope you work it out. Like you, I love the clowns and wish I could have more in my tank then what I have. I'm just nervous of losing them.
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