I'll keep him in the 210 then.I think they should be fine. It's normal stuff bgk do. I'm suprised the sun cat can get him to move. I don't think the bgk can/will cause any real damage to the polys and they shouldn't bother him really either.
I plan to move the peaceful fish into the new tank, as the Mota is starting to nip fins again, and in a few instances remove scales. Nothing serious, just normal cichlid fighting, but I would like to keep the Mota with fish that are similar in size and aggressiveness. The more fish I can keep in the 210 the better, as a little over half my fish would be moved over. The Angels, BP, Acaras, Balas, and Severums would benefit from the peaceful com the most, although I would also move the Firemouths, GT, and a couple others so they don't run into issues with the more aggressive fish I plan to stock in the 210.