the black and white he has is common....let me warn you dont put them in the same tank.....they are extremely territorial and will fight all the time....I had 3 together and once they got soe size about a year old i had to seperate them..i removed the most aggressive one thinking the other two would be ok....nope....they are ferocious lil jokers....love em....ive since gotten rid of the commons and had an ally now for a year...My commons would take food from my hand....the allys are much more standoffish....the more aggressive of the 2 is def the commons..good luck with them...they are a treat and they are dirty jokers