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stones from Napier


funkyfish

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To test their suitability, put a rock in a small container and pour a bit of vinegar over the rock. If it starts fizzing continually then don't use the rock.

I have gathered rocks locally and just put them inthe tank with no washing or anything but I guess it depends on your pollution levels. Remember rocks can't absorb things like salt from the sea water, they onbly harbour (no pun intended) greeblies on their surfaces.

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