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post #1 of 9 (permalink) Old 09-10-2006, 02:29 PM Thread Starter
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Ph question

The water our of our tap is 7.8 out of our RO system it's 6.8. It seems like a lot of the fish I'm interested in (and some of the plants) prefer a lower PH. If I were to use RO water for my tank what else would I need to add besides the normal ferts and CO2?
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post #2 of 9 (permalink) Old 09-10-2006, 03:07 PM
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What is the pH of your tap water after it has set for 24 hours?
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post #3 of 9 (permalink) Old 09-10-2006, 03:34 PM Thread Starter
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Good question. I'll set out a bucket tonight and tell you tomorrow.
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post #4 of 9 (permalink) Old 09-10-2006, 09:27 PM
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i wouldint really know but theres a product called kent r/o right it re adds the nuitrients and balances r/o water it will add kh and gh causing a stable ph but i dont have r/o so make sure with someone else first.


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post #5 of 9 (permalink) Old 09-11-2006, 10:25 PM Thread Starter
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Okay, I checked the PH after a 24 hour sit and it's still 7.8.
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post #6 of 9 (permalink) Old 09-11-2006, 10:31 PM
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Quote:
Originally Posted by thekarens View Post
Okay, I checked the PH after a 24 hour sit and it's still 7.8.

instead of a bucket full of water, fill a test vile of water.

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Ry

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post #7 of 9 (permalink) Old 09-11-2006, 10:36 PM
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For lower pH, unless your kH is sky high (which unless there is something very weird in your water will not be the case) you don't need the RO water, just inject CO2. This will help your plants alot, and won't hurt your fish.

With straight RO water, you will need to add RO right, or the equivalent. Then, you will likely need to add a buffer as well, as you're likely to end up with high pH anyway.

If you mix the RO water and your tap water, you will end up with pH 7.8, even if most of it is RO water.

Bottom line--RO water reconstituted with RO right is expensive. Tap water, if the GH is under 6, will work fine for most plants and fish that like low pH if you inject CO2. If you GH is over 6, consider mixing with RO water to get a lower GH, and inject CO2 to lower the pH.
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post #8 of 9 (permalink) Old 09-12-2006, 01:00 AM Thread Starter
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I kind of figured it wouldn't be feasible to use the RO, but I really love the rummy nose tetras and some of those asian plants that like the lower PH. I'm sure I'll find other fish and plants to make me just as happy. I appreciate the advice.
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post #9 of 9 (permalink) Old 09-12-2006, 03:38 AM
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I don't see why you couldn't keep those fish. The key is acclimating them right. Perhaps buy them from a supplier that has simular conditions as yours then the risk of shocking them is less. The only issue in harder/ more Alkaline water is that the fish don't breed.

As far as plants in general as long as the plants have plenty of light, Co2 and ferts they grow just fine. Only a few plants need low KH like tonnica for example. Contrary to what you might think harder water may actually be beneficial. The plants use the calcium and magnesium that make up wate hardness. At least 4 degrees of GH is fine. More won't hurt, but the plants don't need it.

Find out your KH (carbonate hardness) and GH (general hardness) This is more usefull then PH.

The KH test kit will be usefull anyways when you start injecting CO2.
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