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increasing GH
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Angry Andy
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Joined: 26 Sep 2006
Location: St. John's, NL, Canada

PostPosted: 2007.01.18(Thu)12:50    Post subject: increasing GH Reply with quote

Does anyone here have any solid experience in increasing water hardness (GH) apart from using products like African Cichlid water conditioners, without simultaneously influencing KH or pH values?
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Minsc
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Joined: 03 Jan 2006
Location: Framingham, Mass

PostPosted: 2007.01.18(Thu)13:50    Post subject: Reply with quote

I've used calcium sulphate, aka gypsum, and magnesium sulphate, aka epsom salts to raise the GH before. I found 5/8 tsp calsium sulphate in 10 gallons will add 18 ppm Ca, or 2.5 dGH. 1/2 tsp magnesium sulphate in 10 gallons will add 6.3 ppm Mg, or 1.5 dGH. Gypsum is commonly used in beer brewing, epsom salts can be found at any grocery store.

There is this link:http://www.aquaticplantcentral.com/forumapc/fertilator.php, which slightly disagrees with my numbers, but that can easily happen using volume instead of weight.

Mix the powders, in seperate vessels, with just a very small amount of water, then add the slurry to the tank, or water change water.

It's best to not subject fish to sudden changes. A couple degrees hardness a week is all I would feel comfortable with.

Any specific reasons for adding hardness to your water?
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Angry Andy
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Joined: 26 Sep 2006
Location: St. John's, NL, Canada

PostPosted: 2007.01.18(Thu)17:27    Post subject: Reply with quote

Minsc wrote:
Any specific reasons for adding hardness to your water?

I wish to achieve the most optimal water conditions for my goldfish.

I keep my tank's pH at 7.2 w/ KH at 70-80ppm (3.92-4.48 dH) by adding two doses of baking soda, increasing my KH count by no more than 20ppm (1.12 dH) per 24 hours, following a water change.

My tap water parameters:

pH: 6.4
KH: < 10ppm
gH: < 20ppm


From what I understand, while goldfish will tolerate a very wide range of water hardness, they thrive best in moderately hard water, no? Cranking up my gH will also cut down on the amount of baking soda required to keep the buffering capacity at suitable levels (approximately 80-100ppm).

I would entertain the idea of adding crushed coral to my substrate (bagged in nylon, under the gravel, of course) to raise the gH and KH counts simultaneously, but I have no idea as to how much to add. If I add too much, it'll be an African Cichlid aquarium. Laughing

While the baking soda calculator has been quite helpful up to this point, is there an equally reliable calculator for crushed coral/limestone, etc?

Thank you for your help.
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