I have read they are hard to sex it is probably 3+ inches. I bought it a week ago (it was the biggest one at the lfs
)and put it in my all male tank and everything was calm for about a week but today it seems like there has been a lot of chasing in my tank which is not the norm. I'm wondering if maybe it's a female and is riling up the boys. I tried to catch it to vent but I gave up after half an hour.