Yup that is all it is. Actually from my reading, for those who don't want to spend the money to buy stuff like garf grunge, apparently lfs will just give away all of the crap on the bottom of there live rock curing tank and or any stuff left in the box that the live rock comes in. Many people including myself at one point in time would just throw away all of the crap sitting in the bottom of the box, but most of time that has some of the most benefical stuff in it for your tank.
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CollegeReefer
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