Ok I first noticed this on ONLY my Blood Fin Tetras and then I notice that one or two of my GloLite Tetra have same thing, in this picture you will notice that the ends of the fins appear clear, but they are really more white to appearance. Fish aren't looking distressed or unhealthy. They swim around normal and eat normal. Is this something to be concerned with or is it just from their tails having color and fading?! THanks!