Just got these two yesterday and was assured they are a pair.They are still settling in but both appear to be females to me although the "male" is twice the size of the female and much stouter in the body.They both have quite a bit of yellow in them and the larger has staked a territory and chases the smaller out of it whenever she ventures too near.The smaller is all over the tank whereas the larger stays in the back of the tank is "his" territory most of the time.Just wanted some opinions I guess.
Male:


Female:


Male:


Female:

