I dunno if this is the 'aggression' your looking for , but he/she seems to be very responsiveSo what is the aggression. Like on the emperors are they like the pleuros? I really like the pleuros personality’s just not the looks
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Yes you could house a solo channa marulioides in the 6x2x2 , they are about as big a species as you could get in that sized tank.