Question- did you determine if those rainbows are male or female? The reason I ask is because I’ve looked at your video over and over, and that fish looks so very similar to 2 rainbows that I have. They were sold to me as “male Boesemani” and I do wonder about that. One of my fish is developing the hump on his(?) back, but the other fish is still quite smooth and they are both long not wide at all. But anyhow the coloration and shape is so NOT (male) BoesemanI so I wonder if they are female.
I actually didn't end up buying the fish. The more I researched it, the more I think this one is a female, though. I figured I would wait a while and see if it had matured any over a few weeks. I should go back and check if it's still in the store. This is definitely a Turquoise Rainbowfish, also known as Lake Kutubu Rainbowfish. Do you have any pictures of your rainbows?