At three inches any guess is a stretch. It isn't big enough to start demonstrating any male characteristics so you really can't tell. Wait until it is a few inches longer and you should start to see an elongation of the dorsal fin and somewhat of the beginnings of a nuchal hump if it is male. Hope this helps.
I have 2 terrors and had no idea on the sex until yesterday I noticed wigglers in the tank and the mom protecting them viciously. I've only had them for just over a month. I purchased them they both were appox 1.5 inches.. The male has grown to about 3 in the female has barely changed at all... Maybe 2 inches at the most. She is much darker than the male, almost a charcoal color. The picture you have looks like my male.
I had no idea they were of breeding age and just bought the 2 because i was stocking my tank after being upset because I couldn't find Convicts on the island.
I'm in no way and expert, but compared to my 2, yours looks like my male.
Correction: My male is about 4 inches long now... Was at work when I made the last post. I'm trying to upload some photos of the pair and the wrigglers.
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