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Old 07-28-2005, 06:31 PM   #1
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Water hardness?

I tested the water hardness in our 36-gal FOWLR tank the other day, using the KH test in our Tetra kit. The procedure is to add successive drops to the test vial until the color changes from blue to yellow, and the KH value is the drop count. It said 8-10 is the desired range for a SW tank, but I got 13.

Is this a reliable indication that our tank's water is too hard, i.e. contains too much calcium carbonate? If so, would this be due to overuse of the buffer additive? I've been using "Proper pH 8.2", which claims to automatically adjust pH to 8.2 and increase KH while not adding any phosphate.

If too-hard water is a problem, what's the simplest cure? Just use bottled water from market? Or would I need to get RO water from LFS?

Our fish are thriving.

Grateful for any advice.

Bob Peitzke

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Old 08-02-2005, 11:34 AM   #2
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It's really best if you are at 12 - 13... It will also keep your PH from dropping.

June 30 start date
75 gal FOWLR. 110 lbs. LR, 20 Hermit Crabs (15 blue leg, 5 red leg) 2 Ocellaris Clowns, 1 Purple Tang, 1 Royal Gramma, 1 Serpent Star. Cascade 1200 Canister filter, Red Sea Deluxe Hang on Protein Skimmer, 2 rio 600 phds, 2 in Aragonite substrate. / QT tank 10 gal 5 lbs. LR, Hang on spill over filter & 1 phd w/ attached filter. (currently housing Coral Beauty)
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Old 08-02-2005, 01:04 PM   #3
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Re. water hardness

OK. I won't worry then.


) Bob
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Old 08-02-2005, 06:19 PM   #4
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I would eventually invest in an RO/DI unit. There are some folks here that bought them off of EBAY for a reasonable price. It would be worth it in the long run.

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Old 08-03-2005, 04:54 PM   #5
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13 DKH is not something I would strive for but any problem that may arise from it would greatly depend on your Ca level and any invertebrates you may be keeping.

Alkalinity does help maintain/stabalize pH but artificially increasing the levels that high is not really beneficial. The proper pH product your using is what's causing the problem. If your constantly needing a buffer to maintain pH levels above 8.0 during the day, your problem will be with the tank set up/aeration, not chemistry.

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