There are actually two that are "In question" they are identical except in size, and the one tends to pale out more than the other. The smaller one, in the photo with the calvus, will pale out to where his stripes are barely visible (as seen in the photo), the larger one in posts 1, 22, and 23 does not seem to pale out as often or as drastically as its sibling. But they are both from the same brood.
21&22 you can see the shape of the mouths, even when small that shape is there. A lfs had a show tank with both in there, thats how I got to see the differences.