Got two pairs of barred midas, the smaller pair 5 to 7 inches has a pinkish with dark stripes while the larger pair 6 - 8 inches is gray with dark stripes, my question is will the smaller pair loose their pinking hue as they grow ?
Agree with ragin, there are at least half dozen species and many location variants of barred Amphilophus, knowing which species/location variant would help.
Without that kind of info, its just a crap shoot.
As an example (because barred midas is kind of a catch-all term)
below, Amphilophus sp Amarillo juvie
as an adult
now a young Ampilophus flaveolus
same flaveolus 3 months later