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I bought some nice purple rock from my LFS but it cost me 8 bucks a pound, considering getting some of this as well to fill in the tank some more, reviews seem good.
The Pukani rock is way lighter than the reef saver I bought 150 lbs for my 180 and used half to fill the tank for a 135 i would start at 75lbs and then add a small amount of live to seed.
Give it a good soak before using mine leached a bit of Phos.