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Yes,just make sure the rocks are clean,give them a good rinse & they should be fine.I have a 125 gallon tank and do it all the time when I find cool looking rocks.
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Sure, just clean them and check them first. Wash the rock really well in hot water and scrub off any dirt. Once dry, drip on some vinegar and see if it fizzes at all anywhere on the rock, if so, don’t use that rock. If it doesn’t fizz, place it in a bowl of water and cover it over night. If in the morning you find an oily film on the water, don’t use the rock or if the roick has flacked or crumbled at all in the bowl, don’t use that rock. Most will be just fine, but do take the time to check each one first for the health and safety of your fish.
MM
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Yes i used some from a river but make sure you wash them of and clean them with anti bacterial soap
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I tried that once and had bad results. Too many germs and algae spores. I think maybe if you boil them for 30 minutes in a pot of water, maybe then it would be OK.
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