These have less room and seem perfectly fine. Like I said mine are in a 4' 75 and have yet had to divide em due to aggression. Just kept the male well feed and have a few targets to attack and you should be fine.Divided the tanks just too small for a pair the male would have 2.5 x 2 ft to move around in
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http://youtu.be/80uYO09LuIE
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