Are these rocks safe for planted tank? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 04-17-2013, 10:51 PM Thread Starter
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Are these rocks safe for planted tank?

Brand new to this hobby and in really excited to get started. I want to utilize these rocks in my tank and was wondering if they would be alright. I'm in Florida and these rocks are making a natural seawall at a local port. Since I'm in Florida Im worried about limestone. Is their a test I can do to see if these are tank safe?
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post #2 of 6 (permalink) Old 04-17-2013, 11:15 PM
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#1 Put the washed rocks in a bucket of water. Put another bucket of water aside as well. Compare the KH and GH of both over a period of a couple weeks. If there is a difference then there is carbonate in the rocks.

#2 Drop the strongest vinegar you can find on the rock and try to see if there is any bubbling.

#3 Put a drop of nitrate test solution #1 on the rock. Works great and bubbles up right away if there is a lot of carbonate in the rock.

#4 Use the rocks and do regular large water changes to keep the hardness from creeping up too high.


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post #3 of 6 (permalink) Old 04-17-2013, 11:42 PM Thread Starter
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Thanks Kathy, I will give it a whirl. Here's the pics I forgot to load up incase anyone has seen these rocks before. Also, I'm thinking I won't be able to use them because my tank is only a 6.6 gallon. Not much water to take on the least bit of hardness. My tap water is already around 7.6

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post #4 of 6 (permalink) Old 04-17-2013, 11:51 PM
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Looks like granite - probably safe. Def not limestone, at any rate.
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post #5 of 6 (permalink) Old 04-18-2013, 12:29 AM Thread Starter
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Thanks fishermike. Looks like I may have something usable.
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post #6 of 6 (permalink) Old 04-18-2013, 10:34 PM
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Looks like it's probably metamorphic with the banding, maybe gneiss? (same basic components as granite, just warmed and squeezed a bit)

So, yeah, should be fine for pretty much any set up.
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