GH and plants - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-24-2009, 06:56 PM Thread Starter
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GH and plants

Not sure what I'm seeing. Water changes and parameters were set Sunday on all three of my tanks. Tested today and dosed as needed.
The most heavily planted of the three was out of range from the other two in that chemical drop tests showed a change in GH (decrease) not shown in the other two. It has a substantially larger volume of fast growing plants, more plant mass as well than the other two.
All the tanks were mineral deficient long term (approx. 10 months) until last week in one form or another. Is it possible for plants to reduce general hardness?


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2-75g planted, 3-55g planted, 110g w/30g sump, 2018 update returning to sanity (Nutz)
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post #2 of 4 (permalink) Old 03-24-2009, 07:43 PM
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Yes, plants use calcium and magnesium, the primary ingredients in GH, so if you don't replenish those two elements either by water changes or by dosing, the GH will drop.

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post #3 of 4 (permalink) Old 03-24-2009, 09:02 PM Thread Starter
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GH drop

Hoped that was the case, not something weird and thought it could be thanks Hoppy. Just never saw this before.
Tank readings over 1-2 weeks always read a rising GH so the water changes consisting of distilled water only reduced the 'hardness' of the water but did nothing to replace minerals. The cost being over .84 per gallon (when I started) the tanks never got back down to 2dGH or 3dGH so minerals could be added back. With single water changes of 20 - 30 gallons on a 75g tank with a GH reading 8 or above the hardness would not reset low enough to add back. It took 50% x2 on one and x3 on the other to reset down to 2dGH. Then I could add back and did. What ever minerals the plants weren't using stayed in the tank building up to give a reading. Reset back to 5dGH with the Grumpy mix I'm using and with larger weekly water changes hopefully that's the end of the shortages.


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post #4 of 4 (permalink) Old 04-22-2009, 12:33 PM Thread Starter
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GH Update

GH drops are no longer happening other than volume changed drops with water changes of R O water. Pearling is cool! Plant color and growth is improved and leaf structure is thicker on some sword species.


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