Tropical Fish Keeping - Aquarium fish care and resources

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bassque 01-23-2008 12:05 PM

Very Hard Water - What's the best way to lower the GH
Apparently I have very hard water. I measured the GH and it's about 20 degrees, KH is about 3 degrees. Most of the fish I'm going to be adding are best in 10-15 degrees KH. If I add more co2 will that raise the KH? If the KH rises will the GH decrease?

fish_4_all 01-23-2008 12:16 PM

KH and GH are independant of each other. CO2 shouldn't effect the GH.

When you say oyu have hard water, did you test the tap water or this only in your tanks? There might be some coral pieces, limestone or something else that is there effecting your GH.

Let us know what your tap water readings are and we can go from there. Also, if there are any shells or other odd things you have in there so we can tell if they are affecting it.

herefishy 01-23-2008 12:22 PM

You can always start using RO water and adding the elements you need to bring GH, KH, and pH to the levels you need. Most lfs's now offer RO water for sale. Or you can invest in a RO system yourself. The cost of an RO system ranges from $250-$600 depending on the type and capacity of the system. Maybe you could sell some of the RO water to your lfs for resale. That would help pay back the cost of the sysem. My RO system cost around $450 installed.

bassque 01-23-2008 12:27 PM

Substrate is strictly Flourite and Tahitian Moon Sand which is not supposed to effect the tank parameters. I do have some driftwood, 4 medium pieces. co2 injection is using a RedSea Turbo CO2 Bio-System.
I'll get the reading on the tap water and post the results in a few hours when I get home.

bassque 01-23-2008 05:07 PM


The tap water tested with about the same KH of the tank at about 4 degrees, but the GH is about 7 degrees compared to off the chart at around 20 degrees from the tank. Any ideas?

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