How to lower dKH? - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 10 Old 10-28-2008, 08:49 PM Thread Starter
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How to lower dKH?

Got the tank all setup and most of the numbers look great. It's currently cycling with some live rock. My dKH is high, 16, so how would I go about getting it down? I plan to keep a number of soft corals, zoas, mushrooms, etc, and don't want them to have any trouble.

My other numbers are:

Ammonia: .25ppm
Nitrite: 0ppm
Nitrate: 0ppm
PH: 8.4 (my tap water has high PH)
Phosphate: 0
Calcium: 420
S.G. 1.022

I don't have a Mg test kit yet, but soon. All the rest of the tests are from A.P.I.

I have not used any additives or buffers. I used Instant Ocean "Reef Crystals" salt mix. Will it go down on its own with time? I want everything to be right before I start adding live stuff. Should I bump the S.G. up a bit more to 1.023-24?
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post #2 of 10 Old 10-28-2008, 08:58 PM
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check this site Melevsreef.com - Chemical Solutions then hit [ctrl] + [F] and type lower alkalinity and what are you trying to keep in the tank? fish soft corals SPS? if coral then you'll need to raise your SG to1.025-1.026

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post #3 of 10 Old 10-28-2008, 09:38 PM Thread Starter
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I'd like to keep mostly soft corals, but some sps up at the top of the rockwork may be in the future.

Guess I'll worry about getting that s.g. up before I worry about dKH.
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post #4 of 10 Old 10-28-2008, 09:45 PM
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agreed

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post #5 of 10 Old 11-06-2008, 02:47 PM Thread Starter
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Ok, I've maintained the S.G. at a steady 1.025 for a few days now. My dKH is still high at 16, calcium is 400. All the test kits are under 4 months old from the date of manufacture.

Any ideas?
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post #6 of 10 Old 11-06-2008, 10:54 PM
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i personally would just leave it as you said your just cycling at the moment.

its going to drop over time
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post #7 of 10 Old 11-07-2008, 05:23 PM
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I agree with onefish, and GJ on rasing your SG.

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post #8 of 10 Old 11-08-2008, 11:13 PM Thread Starter
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I've already raised the SG to 1.025 and it's held steady for several days now.
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post #9 of 10 Old 11-09-2008, 08:42 AM
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The SG will not fluctuate on a regular basis. Some salt will be lost to salt creep, but this adjustment should be minimal. You will also see SG raise due to evaporation, but daily water replacement will prevent this from being an issue. I think 1.025 is on the high end, and would personally suggest 1.023 to 1.024.

Don't be concerned about the 16dkh reading. It should naturally fall. Honestly, given the calcium reading of >400ppm... i am willing to bet that your DKH test result is incorrect.
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post #10 of 10 Old 11-23-2008, 04:44 PM Thread Starter
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Ran all tests again last night.

PH - 8.3
Ammonia - 0
Nitrite - 0
Nitrate - 0
Phosphate - 0
Calcium - 420
dKH - 12!
Mg - 1250
S.G. - 1.024-1.025

Everything looks good! I got a Skunk Cleaner Shrimp a few days ago and he is a sight to see. My tank is in the dining area, probably 15-20ft from where I sit on my couch, and I can pick him out from across the room.
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