I would guess male pal, I have a suspected female at this size down in Kent whoop!-)
Female have black in the dorsal, pectoral and anal fins.
Might be wrong at this size but keep checking the fin colour pal.
Here's my recent pick up for comparison mate.
No way to know the sex 100% correctly at this size. I have 4 blue umbees. All looked the same but one turned male and the others turned female after two months.
I would lean towards male too but at this size and even a couple more inches can be still hard to tell.. Age plays a bigger part in being able to sex cichlids at small sizes..