Help rock for aquascape - The Planted Tank Forum
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post #1 of 4 (permalink) Old 09-22-2016, 01:06 PM Thread Starter
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Help rock for aquascape

My GH keeps raising even I did water change last week with 80%RO
GH was 25ppm last week
Now is 175ppm and my HC does mot seem to like it
I dont know what raise my GH so much
I have this rock in tank
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post #2 of 4 (permalink) Old 09-22-2016, 02:42 PM
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Water parameters are a hard thing to pin down as well as what is bothering plants so it may take some work to solve the question. There may be other things or it could be the rock so some testing is needed. Can a piece be broken off the rock to put in water to test for change? I would also look at ALL the other parts of the puzzle like the sand or gravel on the bottom or any other decor items. Any concrete castles or ships? Those are often a big question.
Add test items to a bucket of water and look for which changes the water? To save time, I would not assume that one item was the cause but test a sample of all the suspect items at one time.
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post #3 of 4 (permalink) Old 09-22-2016, 02:59 PM Thread Starter
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I have Eco complete substrate, and other plants in the tank, I dont have any other decor. Btw it is a dragonstone as I check on website.
Will the fertilizer affect the GH too, Ph is good, Kh is good, only GH always high. As check Seachem root tab has 14% of Calcium is that one of the problem?
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post #4 of 4 (permalink) Old 09-22-2016, 04:56 PM
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When you see rocks with lots of smooth holes in them you are very likely looking at limestone or dolomite, both of which will slowly dissolve in water, especially if the water has a pH below 7.0. That will increase the GH of the water. Just because the rocks are given dramatic or descriptive names does not mean they will not be dissolving in your water and raising the GH.

You can still use those rocks, but you will have to do regular big water changes to keep the GH down. If you change half the water every week, you limit the increase in GH to twice what the rocks are causing per week. So, if you gain 2 dGH in a week, doing weekly 50% water changes limits the total rise in GH to 4 dGH.

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