The chest area seems deep, which would have me thinking female.
But the ventral fins long string like ones in front seen to pass the anal fin and that would point towards a male. It is possible it is still at a young enough age to tell.
If it builds a bubble nest, it's a male.
Look for the eggspots, as the fish gets older, the ovipositor tube, on the under belly sides like a dot after the ventral fins and before the vent and anal fin.