The dark line down the middle comes and goes depending on stress, what tankmates it's near, feeding time and age I think (IMO). The first pic is from the 19th. Since then that fish has 'matured' a lot and paired off with another and they show no line down the middle at all now and instead feature a very contrasting barred side with gorgeous deep blue spangling/spotting on sides and an even deeper blue in their pelvic fins.
I certainly don't have a ton of experience with them, but felt that your picture looked incredibly similar to mine when I first got them.
Here is what the one from the 19th pic looks like as of 2 days ago paired off. This was the best pic I could get but you can tell a lot of the color differences from the 19th to the 25th


I certainly don't have a ton of experience with them, but felt that your picture looked incredibly similar to mine when I first got them.
Here is what the one from the 19th pic looks like as of 2 days ago paired off. This was the best pic I could get but you can tell a lot of the color differences from the 19th to the 25th

