GH Fluctuations - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 01-03-2016, 12:29 AM Thread Starter
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GH Fluctuations

Would lowering GH (via water changes w/ RO water) by one degree a day for a few days in a row (ending at a suitable dGH) be harmful for plants or fish?

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post #2 of 4 (permalink) Old 01-03-2016, 12:45 AM
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I don't see where that would be a problem. It would certainly be far better than making a big drop in GH with one water change.

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post #3 of 4 (permalink) Old 01-03-2016, 12:46 AM
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The most delicate fish would prefer that the GH drop no more than 10% with any one water change, and you could do 2 such water changes in one week.
More durable fish can handle a bit more, perhaps a 15% drop in the GH with any one water change.

It takes time for the fish to adapt their metabolism to the new conditions.
Let it take time- if it takes a month to drop the GH to where you want it, let it. Slower is safer.

What is the current GH in the tank?
What is the goal?
What fish species?
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post #4 of 4 (permalink) Old 01-03-2016, 01:37 AM Thread Starter
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Current GH is 9 dGH according to my liquid test kit. Goal GH is somewhere in the 4-6 range. My plan was to do a few water changes (approximately 10% tank volume), with each water change lowering the GH by 1 degree.

The tank was originally in this range, however I was noticing some hard water stains and a bit of stubborn filamentous algae which tipped me off that something was not right. Combined with the prospect of getting some new fish later this week, this led me to investigate further and test my water. Turns out I had fallen behind on replacing my RO/DI cartridges - the output water is around 1 dGH but I did not account for this when remineralizing or just plain topping off with the water, which presumably led to the several dGH increase over time.

Current inhabitants are otos and amano shrimp. The fish I am looking to add later in the week are chili rasboras. Eventual inhabitants (at least a few months off into the future) will include a group of chocolate gouramis. Of course I would finish my series of water changes before introducing anything new into the tank.

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