genders

Heres my 2 electric yellow labs, i think i have a male and female but wanted to see if you all could verify. Thanks

I have never been good at sexing fish that aren't truly sexually dimorphic. Can anyone lend a hand/eye? I hope to figure out who is pairing up in my New World tank and decide on the future of these fish. Salvinis: Fish 1 - Larger, more colorful. Fish 2 - Smaller of the two, considerably...