If your LR is not already cured, make sure to cure it without a sandbed. This way, all the crud (and there will be a lot of dead stuff that will slough off your uncured rock) can be siphoned out. I use a turkey baster on curing rock to blow off anthing loose on the rock. You wouldn't believe what I siphon out weekly on the 20 lbs of LR currently being cured.
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