Rocks for planted tank - The Planted Tank Forum
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post #1 of 4 (permalink) Old 08-12-2012, 09:02 AM Thread Starter
Algae Grower
Join Date: Apr 2012
Location: India
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Rocks for planted tank

Are these rocks useful for planted tank.

Will they alter water chemistry ?

I am not too sure about the rocks with holes, I have seen them in cichlid tanks. But not in planted ones.
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post #2 of 4 (permalink) Old 08-12-2012, 12:31 PM
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To my knowledge anything you add to a tank has potential to alter chemistry, and most rocks would do so... I had to take rocks out of my one tank before I added fish because it raised Ph too high from what I wanted it to be.. I'm sure someone more educated on topic will chime in but I would say yeah it would.
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post #3 of 4 (permalink) Old 08-12-2012, 04:40 PM
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Those look like the kind of rocks used here in cichlid tanks to raise the pH and KH. If you change water often then that might not be a bother. If these rocks are yours then put into a bucket with water. Have another bucket of the same water standing as well and test the water from each bucket once a week or so to see what happens. If the KH shoots up to 15 in a week and the other bucket's water is 2 then you might not want to use it. If the change is from 2 to 4 and you plan regular large water changes then it might be just fine. Plants use the minerals found in KH and GH, they aren't bad to have.
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post #4 of 4 (permalink) Old 08-12-2012, 05:40 PM
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Ditto: Those look like rocks that dissolve easily, such as Holey Rock, Limestone and related materials.

I would test these in a bucket of water, testing GH, KH and pH (TDS if you have a meter) every few days for a week, then weekly for as long as you want to run out the test.
I think you will find they would make good rocks for a hard water tank (live bearers, African Cichlids, certain Rainbows) or a brackish water tank.
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