Looks like a male to me, more stripes (5) and a pointed anal fin, females is rounded and supposedly they have less stripes... I would strongly advise against adding a second though, unless you catch yours house it elsewhere for a while then introduce them together, and even doing that expect ww3 for a while... been there and failed.. I’ve currently got 3 dwarfs in the same tank, so it’s not impossible...
I know I am pushing my luck with the tangs at the moment, just a thought. ;)

