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Old 05-17-2005, 10:46 AM   #1
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ph

I have had my tank for 10 months now and I am still having a ph problem.
My ph always falls to 7.8. Does anyone have recommendations on what to do or use?
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Old 05-17-2005, 11:26 AM   #2
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falls to 7.8 when? overnight?
what's your alkalinity at?
can you give full tank specs: tank size, lighting, inhabitants, skimmer? refugium? live rock? substrate of crushed coral, aragonite sand, or silica sand?
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Old 05-17-2005, 12:54 PM   #3
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my ph doesnt just fall it just stays around 7.8 I can get it up to 8.2 but then it falls back down overnight. It is a 75 gal, ls, 80 lbs lr, yellow tang, hippo, lionfish, puffer, blennies, dwarf angle, clown,4 crabs, urchin,2 star fish, 2 oysters, and a couple of things that came off my lr that look like they can be snails or something of the sort. I have a sea clone skimmer and a wet/dry system. I use ro water only.
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Old 05-17-2005, 01:35 PM   #4
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and what is your alkalinity at?
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Old 05-17-2005, 01:41 PM   #5
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the test kit I have says: normal/low
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Old 05-17-2005, 02:05 PM   #6
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I have been using a reef buffer to raise my ph should I stop?
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Old 05-17-2005, 02:08 PM   #7
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Are you getting good oxygen exchange at water surface? I was having problems with pH and removed my glass top and increased surface movement and pH came up OK.
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28gal bowfront
40lbs livesand(bag from LFS), 30lbs live rock(LR.com)
2 O. Clowns
1 peppermint shrimp, 5 red leg hermit crabs,
4 mexican turbo snails, 15 nassarius snails
ricordea mushroom, candy cane coral,
super color polyps, hairy mushrooms
bubble coral, hawiian feather duster
coralife lunar 2x65, HOT magnum canister
10 Gal refugium(chaeto) & seaclone skimmer
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Old 05-17-2005, 02:13 PM   #8
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I will try to increase my surface movement and see if that changes anything. All I know is I want to get this problem solved before I go on vacation in 2 weeks last thing I want is to come back to a dead tank
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Old 05-17-2005, 02:56 PM   #9
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My first recommendation, get a new test kit...one that actually gives you dKh, meq/l or ppm results...actual physical numbers. I'd suggest SeaChem or Salifert, although when I've tested my Aquarium Pharmaceuticals brand kit against them, I get the same results, and it's a lot cheaper.

You probably have low alkalinity, and if you've got poor gas exchange, the CO2 in the water will lower your pH as it creates carbonic acid.
You're probably not dosing enough reef buffer either. I suffered from the same ailment until I was given this webpage: http://home.comcast.net/~jdieck1/chem_calc3.html

It has lots of common buffers and calcium supplement brands...you input current levels, and desired levels, along with tank volume, and it gives you the exact amount to give that increase to the desired level. Of course you can't add too much all at once, but in my case, I was doubling the dose that the label gave for calcium (1/4tsp) every 2 days. Turns out I needed 7.6 full teaspoons to get to my goal level. So I simply up'd dosage to daily (which I admit I should have been doing all along) and used slightly rounded teaspoons. Now my calcium is where it should be, and is easy to maintain with the smaller doses per the label.

But of course you'll need a different test kit so you know what your alkalinity/carbonate hardness is at. You'll want about 3meq/l or 9-10 dKh or 170ppm.
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