Water Question. - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 02-25-2009, 01:30 PM Thread Starter
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Water Question.

So i am setting up a small planted tank (10gal) on my desk and where i live we use a well as our water supply which produces very hard water (no suprises here). I planned on just buying water for my tank being that it is only a 10 gallon, so i picked up a gallon of "purified water" (R.O.) and a gallon of distilled water to test. The R.O. water has a pH of 6 or lower (test only goes down to 6) and a KH of 1 (or 1 dkh). The distilled has a pH of 6.4 and a KH of 1 (or 1 dkh). I plan on adding CO2 (yeast) which i know will lower the pH as well. So then i thought maybe i would just add some crushed coral in the back of the AC 20 im using for a filter. Or what about doing some sort of water mix like 1 gallon well to 2 gallons bought water. What water would you suggest buying and whats your opinion on the best solution. Thanks -elliot
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post #2 of 5 (permalink) Old 02-25-2009, 02:29 PM
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There is really nothing wrong with using hard water. Your plants will adapt - in the wild hard water is considered more productive (easily available Ca and Mg). Depending on where your plants and fish come from, they might already be adapted to the local hard water.

Crushed coral gives you a continuously increasing GH and KH through the week between water changes. If you want stability it is not the way to go. GH booster added to RO water would work and so would mixing RO with your tap at the same ratio each week (with 50% water changes).

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

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post #3 of 5 (permalink) Old 02-25-2009, 02:46 PM Thread Starter
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ok so ill pass the crushed coral and i did some more experimenting with the water and i will plan on doing a mix. but why 50% weekly changes ? i was planning on doing like 20% weekly.
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post #4 of 5 (permalink) Old 02-25-2009, 04:33 PM
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50% water changes were likely suggested under the assumption that you would be using the Estimative Index (EI) method of dosing fertilizers. Lots of folks use here use it, so it has become common to see it suggested.

However, there are plenty of people who make smaller or less frequent water changes. Water changes etc. should be dictated by your specific setup and goals. If you'd like to provide some more info, lots of people here can help you figure out how best to proceed

Mike


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post #5 of 5 (permalink) Old 02-25-2009, 05:48 PM
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If you are just starting (assumed based on your post count), a 50% weekly water change makes the system easier to balance. Sure, you can do less (% or frequency), but then it is easier to accidentally get your ferts too high or too low. Also you are using a small tank, so measurements are smaller and not as precise (1/32 of a teaspoon??). EI and modifications of it seem to be easier to manage. You also don't have to do as much testing with EI methods.

Besides, you have a 10 gallon tank - if you do 3 gallons tap and 2 gallons distilled per week it is still cheap!

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
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