Seashells and Ph - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 14 Old 01-23-2010, 01:03 AM
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Originally Posted by Byron View Post
The acid regeant in a nitrate test apparently works better, not sure but I think it is Regeant #2--it's the one that is an acid anyway.
Bottle #1 is 41% hydrochloric acid. This is a much stronger acid than vinegar and is double the concentration of the "other" commonly available strong acid, muriatic acid (which is actually just a 20% HCl solution). The ultimate "is ____ made of calcium?" test.

I agree, though. Seashells are almost entirely calciferous material and will most certainly raise your pH and hardness.

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post #12 of 14 Old 03-06-2013, 11:44 AM
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Back to Seashells in fresh water aquariums

What if the shell was sealed with aquarium safe silicone?
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post #13 of 14 Old 03-06-2013, 02:21 PM
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Same thing applies to corals, in case it comes up.


Total years fish keeping experience: 7 months, can't start counting in years for a while yet.

The shotgun approach to a planted tank with an LED fixture

Small scale nitrogen cycle with a jar, water and fish food; no substrate, filter etc
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post #14 of 14 Old 03-06-2013, 10:58 PM
We hear of these concerns and I don't mean to make light of them but I have to wonder to what extent shells dissolve in FW to change the pH. It would make sense if shells were ground into a powder and added to the water, but as hard shells I wouldn't think they could do much to the pH.

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