What could cause one head of a purple tip hammer to change? I don't have a good picture of it in my phone I'll have to take another when I get home. Everything else in the tank is extremely happy and this one seems to be happy too, just one head is a little lighter in color than the other.
Salinity 1.025
KH 9.1
Cal 410
Phos 0.08
Nitrate 15
Mag 1400
Salinity 1.025
KH 9.1
Cal 410
Phos 0.08
Nitrate 15
Mag 1400


