How come some BTA's have different colored tips or tentacles? i have a GBTA that is a clone and its all green and i can barely see a little purple dot on the tips. I have seen some with very bright purple tips or speckled. PS wish mine bubbled all the time.. after i feed it,or when the daylights go off it tends too. during the day it rarely does but i have only had it for three days so far.