my Mayan gets along fine with my green terror and the Mayan is alot bigger than the gt. the mayan likes to hide alot or sleep in his rock, but when hes up there other fishes get out of his way.
the mayan grows alot quicker than the green terror.
the mayan grows alot quicker than the green terror.

and will definitely need a bigger tank than 55. probably double that. I've often read about people keeping them alone or in pairs because they can be such a handful. Good luck