Originally Posted by 1fish2fish
Definitely black copper.
He looks young still and I think he has the potential to go full HM if you work with him. Allowing him to flare at a mirror daily will stretch his fins out and get that HM spread. I usually do two 10 minute flaring sessions a day. Also feeding protien rich foods like NLS grow and Atinsons Betta will help him pack on weight and grow his fins.
I will definitely follow your advice and start working with him. And he dose seem to be very young since he is very small when compared to my other Betta. I will also look for the food and start feeding him that.
For the person that suggested the name Onyx I think it fits him just right :)