Yeah.... you'll find that there are some "aliens" in the rock. Everything from grass seed heads, to dried macros, to dried urchins etc. I put mine in fresh water (dechlorinated) in 20 gallon trash barrels, and kept soaking, rinsing, soaking, until I was comfy with it. You'll know. The water starts off with a rusty hue to it, and when it is pretty clean, it is clear. Even after that, I put it into salt water to cure up for a while. Now, it's in my sump and other tanks with no other life in it except the gazillion munnid isopods that moved in.
You'll really like it. 50lbs is a LOT of rock. It is sooo light and has so many nooks and crannies.
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