Well, I'm under the impression that these fish just adapt allot harder once they are adults, I saw the same thing happen when I moved them to my lfs
, 2 weeks later when I came by to pick up my plants they were also like this.
How large are they? I'm just asking because their eyes seem pretty big in comparisson to their body in this pic (meaning they may be a bit stunted), but it may just be the pic.
And I asked if they were sleeping because IME the brown colouring is camouflage, and mine looked like that during night or when stressed, and normally more like my avatar, although they tend do grow more brownish when aging, and the full keyhole is not always on display, more when mating or breeding or defending territory.
I don't think there is much you can do about this, apart maybe from trying to set them up in a private tank, but even that might not work. They are just extremely skittish fish sadly enough.