water change? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 02-06-2010, 07:53 PM Thread Starter
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water change?

how often should i water change a 15 gallon tank?
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post #2 of 11 (permalink) Old 02-06-2010, 08:13 PM
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how many plants and fish do you have in your tank?
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post #3 of 11 (permalink) Old 02-06-2010, 08:26 PM Thread Starter
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4 leapord danios 5 tetras 5 kitty tetras cherry shrimp,looking at gettn some corys too. plants are on pis on my album
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post #4 of 11 (permalink) Old 02-06-2010, 08:50 PM
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Do you use CO2? If not, you can change water based on the need to eliminate the buildup of various "bad" stuff from the fish and plants, but do that as little as you can. When you add tap water, you are very likely to be adding CO2 also, and that means a fluctuating amount of CO2 in the water, which can start algae to growing. If you do use CO2, you can change some of the water every week or even every day if you want to.

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post #5 of 11 (permalink) Old 02-06-2010, 09:00 PM Thread Starter
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yeah have co2 so basically 25% change a week?
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post #6 of 11 (permalink) Old 02-06-2010, 09:01 PM
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So... if you don't have a steady amount of Co2 you shouldn't do water changes every week? I have a 55gl well planted tank with a 1gl DIY Co2 (which will soon be 2gl) and a shop light with 2 36watt plant bulbs and the original tank light with 1 36watt plant bulb. I am also dosing dry ferts and excell. Algae is a plenty, not so much on the plants but the back drop I built for the back wall.
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post #7 of 11 (permalink) Old 02-06-2010, 09:06 PM
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Quote:
Originally Posted by luke20037 View Post
yeah have co2 so basically 25% change a week?
ya that should be good
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post #8 of 11 (permalink) Old 02-07-2010, 03:00 AM
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One way to start with water changes is to keep the nitrates between 5-20 ppm.
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post #9 of 11 (permalink) Old 02-07-2010, 04:10 AM
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If the plants are growing, in a high light tank, the nitrates will be taken care of by the plants.

A non-CO2 tank is much more likely to remain algae free if you don't make big water changes. A small change isn't likely to do any harm, but a 50% change can introduce enough CO2 to be seen as a wildly fluctuating CO2 level in the water, which can cause algae to start growing.

If you are adding CO2 already, a big water change doesn't do any harm. It is the drop back to near zero CO2 that causes the problems, not going from 10 ppm to 30 ppm (as unlikely as that is) with a water change.

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post #10 of 11 (permalink) Old 02-07-2010, 02:40 PM
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Thanks. Have done a lot of thread reading but still very naive and new to this. This hobby is like a sponge, you can never stop taking in new info.
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post #11 of 11 (permalink) Old 02-07-2010, 03:22 PM
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Originally Posted by Bellaru View Post
Thanks. Have done a lot of thread reading but still very naive and new to this. This hobby is like a sponge, you can never stop taking in new info.
It's worse than that! What you learn today may turn out to be incorrect tomorrow as more is learned about growing plants in water. It gets frustrating at times, but it does make it a very interesting hobby too.

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