Marine betta question

[rachenbrazil]

I have been keeping a marine betta for about 10 years. 7 years ago I tried to introduce second one with no sucess. New fish got beaten very badly in few hours. At that time the tank he was kept was a 90 gal ...in 2007 moved him to current 210 gal tank with lot of rocks.

Yesterday I found an argus marine betta in lfs. It is a juvenile... I was wondering if should try to introduce this one to my old betta...