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21 min.. you have to be kidding..
Not even I post so often to catch every thread that often.. ACK 8O
Do a search.. this has been covered many times before.. It can be done..
Boiling, bleaching, vinegar to neutralize the bleach, and acid testing the rocks is covered. HTH
i dunno lol. the vinegar test is only to show the calcium "content? when when it fizzes it will raise your ph and harden your water. as long as you have soft water and do normal water changes the ph shouldnt change much. id just soak it in chlorinated water for like a couple hours and then dechlorninate the water that its in.
Acid test, wash/scrub (no soaps, etc), then boil for 5-10 min, then *slowly* cool it (don't put it in the fridge/freezer - room temp), then wash/scrub once more, again no soaps
What type of rocks did you find? Are they smooth, jagged, etc. Could make a small difference in the amount of carbon and/or types of dissolved minerals that will leech into the tank, if at all.
Sorry Putiti...LOL. Soak the rock for a couple of days in the vinegar solution. Then, rinse it well. If no particles come off, you are okay. If not, I would ditch it.