neon tetra headpiece

[silvershark]

ok so i've only noticed this since changing over to sand but half of my neons have a dark head and half have a pale head, they all seem fine but are obviously different! they were all purchased at the same time from the same tank too. is this normal or is something up?

 

[Gill]

Check Liveaquaria, it tells you the diff Neons,

You Might have Diamond Heads

tetras