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post #1 of 6 (permalink) Old 03-16-2004, 05:24 PM Thread Starter
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i am setting up a new tank for 2 weeks. the tank is for plants and discuss so temp is at 84. i mix up ro and tap water (50/50) and has a ph of 7.2( ro 6.5 and tap 7.8) and fill it in the tank. after it ran for some days i had a ph of 8.4 and in order to make ph down i put vinegar and it droped down to the level of i wanted which is 7.2. and then a day later i came back to 8.4. can someone help me out on this?


tank:110g, 300 watt total, e-co complet sub, pressurized co2 with plantguild reactor.
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post #2 of 6 (permalink) Old 03-16-2004, 05:38 PM
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Why vinegar and not more RO water? Do you have any rocks in the tank?

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post #3 of 6 (permalink) Old 03-16-2004, 05:56 PM
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Quote:
Originally Posted by SCMurphy
Why vinegar and not more RO water?
I agree. Why vinegar, if you have ro?

A carbonate (KH) test result for your aquarium water would be a big help for those trying to solve your pH mystery.

Ted


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post #4 of 6 (permalink) Old 03-16-2004, 06:33 PM
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I'm not a plant expert but do keep a lot of discus so I know a thing or two about this problem. I would think that you have hard water in your area. If you plan to adjust pH by mixing with RO water, you need to mix more RO water than tap. I use 75-80% of RO water. Mixing 50/50 doesn't mean you would get something right at the middle. It all depends on your water hardness.

Also, as Murphy said, you might have something buffering your tank. It's very unlikely that after the 50/50 mix, the pH would jump higher than the original point (even over the tap water pH). What substrate are you using?
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post #5 of 6 (permalink) Old 03-16-2004, 07:21 PM
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Do you have rocks in your tank? They may be boosing the ph. Try leaving a cup of tap water out over night and doing a ph test. Does the pH change?
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post #6 of 6 (permalink) Old 03-17-2004, 01:41 PM Thread Starter
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i got two peices of rock that hold wood for sinking and i will try more ro and let tap water over night and let see what ph they will be. the reason is that i mixed 50/50( one cup of each) and had a ph of 7.2.
thanks for advise.
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