I owned a 11 incher and he was a few years old when i got him and it took a few more years to get 11 inches. They usually top out at 8-10 inches. From the pic i would say male and very stressed. By the looks of him he may have trouble hitting the 10 inch mark. The 46 will be fine for a a few years. I would keep him alone because he looks like he's been through alot. Awesome fish tho

. I was able to get some seeded material from the original tank to help speed things along. I have no choice but to put my faith into Seachems Prime and Stability along with daily 30% water changes till everything stabilizes.