That kind of looks like a common. I'd print out pictures of BNs and thoroughly compare, then return him.
Ouch.. Yeah they need what, 70gallons? Just huge tanks. Lol
ccross said:I think he'll be ok in my 55 if he is a common. After looking at the other link i added, I think it might be a female BN.
Looks like a bn to me also. It could still be a male as some are late bloomers. And to add to what was posted, if he's still 3" or so after all that time its probably not a common.