I'm not sure. It came w/ the tank when we bought the tank.
We have never had issues w/ nitrates, nitrites or phosphate the entire time we had the aquarium setup.
All of this rock has been in the aquarium for over 3 years.
Pictures really don't do much for the rock but they are nice rocks.
One of the rocks have a 4 inche piece of green monti attached and other have other coral frags.
Thats only $1.58 a pound for all 126 pounds need it gone asap. I can tell you that its not Florida Rock and that it was purchased up in Tampa from the person we bought the tank from.
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