I have YB and specter adult , i also hatched some last year. the belly markers suggest gravel to me : the colors on gravel are darker than Yb and specter. if the breeder is trustable i would believe it s what he said it is.
What is ot you see/look for to suggest that it is gravel? I have a highway x normal clutch pippingnow and need to know how to tell them apart from yb?