Currently have a 13" female sp. marmorata livin with a 14"+ male venezuela, they pretty much grew up together and get along well - often acting like a bonded pair! Sometimes have skirmishes, nothin serious since July. In a community tank with a female 'red tiger' moto., large barred midas male, and a feisty smaller parrot (hybrid). plus a large pleco!
TAZ ~ congrats on your cinctas + johannas. At one point the above marmorata got along with our female cincta. Also had our male red tapajos in with a female semifasciatus for a few months, they each stuck to their own end of the tank ( 'cept at feedin time). It's always an uneasy truce - gotta have a watchful eye!!!