Tail shape differences in young marms.

[rodrigo]

I noticed some time ago, but it´s a lot more obvious now, that one of my juvies has a way broader tail than his sibblings. I mean like thrice as broad, and a different coloration. Also the others deffer between them in different degrees.
I read some post here of karelinii or cristatus larvae having different tail shapes depending if aquatic or terrestrial, as an adaptation. But my marms are all completely terrestrial....so any idea what this means??? Maybe a very very early sign of it being a female Ô_o? They are just under 6cm long so i doubt it...but hey i´m a noob.
Any idea

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[rodrigo]

ok now this is weird....first they are actually 7cm long....hadn´t messured them since two weeks so the other info was old hehe. Second...what i commented in the previous post was two days ago....but now i was feeding them and noticed three of them with that condition...so there a re three with a broad tail and three with a normal rounded one.