kaivalagi
Fish Herder
Also i think your 'female' is a male.
Has a lump on his head and it's a bit too big to be a female.

Here's a pic of the definite male (from over one month back, he is a lot bigger now, ~4" now) in the main tank:

And here's a better pic of the "female" in the other tank (< 3" currently):

Are you positive? The "female" has a slight purple hue on the lower half of it's body and doesn't have any red colouration on the fins, instead they're more bluer fins. The blue is not so full on either, the body is more pastel and not so bright...Also the behaviour of the "female" is nothing like that of the male...in that it is digging a pit etc in the sand...
I am no expert hence double checking but from what I gather I might have a female here???
I have found this page which makes me think I'm okay?: http

Thanks for your help