That is true my friend. All I know about sexing German Blue Ram is from Dean of Aquarium Co-op, aka the male are suppose to have pointed anal fins, extended fin rays and the female short stubby anal fin along with the black spots thing and the pink belly.
I do suspect that the "female" is of the electric blue color morph hence why we are not seeing the pink belly. I did try my best to pick them out from what I know.
So should I try to pick more female to add in there?, I was considering adding like another male + 2 female if I can pick them out, or should I leave them be, honestly they are pretty peaceful with one another. I got a 125 gallon with a 13 gallon sum so about 134-135 gallon of water with about 19 corys, 12 platies, 10 mollies, 4 dwarf gouramis, 4 SAE and 8 Hillstream loaches so I think I can add more stocking.
Btw, that is the color the "female" came home with. Just in my opinion, it may not be a subdominant male since the store has several males like the male I showed you.
What a pair of beauties, I honestly like the regular GBR than these balloons ones. Haizz but they are all I can find around this part of the world