BTW these are best kept alone or in a large tank with places to hide. In my 55 gallon planted I have one that's noticeably smaller than the other and is obviously the less dominant of the two. He get's bullied around for food at times which I believe is leading to his stunted growth. I've noticed that as the plants are filling in he's doing better and starting to fill out more than previously.
You have a beautiful specimen there, and remember they can get upwards of 5-6" in aquariums so it's best to have a decent sized tank for them.