Checked your overflow? 
I bought two Maroons last week, though im afraid the size isn't enough of a difference. It's pretty much been a story of the larger chasing the small away when it gets to close... Usually the larger will pick on of two areas to hang around in the tank.
The smaller will try to get close and chased off.... then it'll circle around trying to get within 2-3"s of the larger then get chased off again. After awhile, it'll stop and find an area away...and stay there, then rinse and repeat again.
I bought two Maroons last week, though im afraid the size isn't enough of a difference. It's pretty much been a story of the larger chasing the small away when it gets to close... Usually the larger will pick on of two areas to hang around in the tank.
The smaller will try to get close and chased off.... then it'll circle around trying to get within 2-3"s of the larger then get chased off again. After awhile, it'll stop and find an area away...and stay there, then rinse and repeat again.