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Old 05-19-2014, 09:36 PM   #1
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Help!!!....What's growing on my lava rock?

I added lawn lava rocks To my tank. Within an hour these green things showed up on the rock. Is this something I should be worried about or is some cool plant going to grow.Click image for larger version

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Old 05-20-2014, 10:15 AM   #2
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Help!!!....What's growing on my lava rock?

I would not advise adding anything from your lawn.
It's probably some type of terrestrial plant seeds that were embedded in the rock and when they became wet, started to germinate. 1 hour seems way too fast for it to be any algae. If I were you I'd take the rocks out because there are a number of undesirable things in lawns such as fertilizers and weed killers that you don't want in a tank. But you could keep a rock in a cup of water to see what those grow into
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Old 05-20-2014, 10:49 AM   #3
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I agree with Khuligirl. My guess it is a terrestrial moss that won't show up until it gets wet. At any rate, if you wanted to use those rocks you would need to either boil them (don't do it--they might explode) or soak them in a mild bleach solution for 15 minutes, then soak again in water with lots of dechlorinator and let dry out for several days. There is still the chance of oil-based insecticide or herbicide chemical residue. Not sure if it is worth it.
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Old 05-20-2014, 11:33 AM   #4
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I boiled them for an hour or two. Making sure they didn't explode. My lawn doesn't receive any pesticides or chemicals.
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Old 05-20-2014, 11:49 AM   #5
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Certain spores can survive boiling, but not many. My bet is it is still a terrestrial form of moss or lichen. I'm not sure if blue-green algae endospores (cyanobacteria) can survive boiling, but that is another possibility.
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Old 05-20-2014, 11:51 AM   #6
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Before I put the rock in my main tank I threw some in a tank full of feeder fish. So dr it's been a week and all the feeder fish are still alive.
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