Thrive and the KH level - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-07-2018, 04:36 PM Thread Starter
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Thrive and the KH level

Will Thrive raise the Carbonate hardness (KH) level of my water? It is already pretty high 150ppm. I have C02 going and everyone looks happy but my Amazon sword plants are not thriving, all of the different Anubias and Java fern are doing great. I do a 25 - 30 % water change every two weeks.

Thank you!
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post #2 of 8 (permalink) Old 06-07-2018, 05:02 PM
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Thrive should have zero impact on your KH. As far as I'm aware, there are no carbonates or bicarbonates being used in Thrive. @nilocg, feel free to correct me if I'm wrong.

Is your KH that high from the tap?
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post #3 of 8 (permalink) Old 06-07-2018, 05:03 PM
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I use thrive and I can confirm that it's had absolutely zero measurable effect on my KH.
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post #4 of 8 (permalink) Old 06-07-2018, 05:18 PM Thread Starter
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Tap is GH-30, KH-100, PH-6.8
Tank is GH-60, KH-150, PH-6.9
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post #5 of 8 (permalink) Old 06-07-2018, 06:00 PM
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Quote:
Originally Posted by tamdwells View Post
Tap is GH-30, KH-100, PH-6.8
Tank is GH-60, KH-150, PH-6.9
What are you adding to the water besides Thrive? I'm curious what's causing your GH and KH to rise so much. If you're not adding anything besides Thrive, do you have stones in your tank that are leaching? What's your substrate?
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post #6 of 8 (permalink) Old 06-07-2018, 11:10 PM Thread Starter
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Substrate is aquarium sand, red flourite, gravel layered in this order, I have a large piece of petrified wood, some quartz rock and a piece of wood that I picked up at my LFS. I had been using seachem Flourish as a fertilizer.
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post #7 of 8 (permalink) Old 06-11-2018, 10:28 PM
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Thrive should have zero effect on KH.
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post #8 of 8 (permalink) Old 06-11-2018, 11:12 PM
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Put some of that sand into a glass of distilled water and add a drop or two of lemon juice. Test the KH and write it down. Then test the KH after a day (sometimes sooner) and compare. The Fluorite and quartz should not be contributing, but it may be worth testing the quartz just in case there is something else in it.

Quick and dirty: pour some lemon juice directly on the sand. If it bubbles, the sand is probably causing it. Vinegar can be substituted for lemon juice.
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