its also a 135g tank which helps a lot. I'm guessing they picked at each other a little more when in the 55? But then again...were they smaller in the 55?
I know that someone here had a clarki and true perc in the same tank, but that was a 90 and they were not in pairs, and the clarki he said was a bit mean at times to the other one.
But what hermanx said about them being tank raised....I'm with hermax... they would probably be better together if they're tank bred or at least tank raised (there is a difference) as opposed to wild caught. I'd think that for a wild caught fish, it would be more natural for them to NOT get along...tank raised/bred fish probably would be easier to get along w/each other.