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Old 10-09-2013, 09:10 AM   #1 
thendeathsaid's Avatar
Join Date: Oct 2013
Location: Singapore
CO2 help please?

I have a betta in a 2.5 gallon tank with a sponge filter and a few live plants. When I put the plants in the pH was around 7.0-7.2, but I tested it again today (a few days later) and it was 7.6+. I read online it could be because the plants are using up the C02 in the water and doing so increases the pH.

Is this true? And if so how should I maintain a low pH? I've seen those DIY kits around but I'm not sure how feasible that is for small tanks like mine. Any recommendations?
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Old 10-10-2013, 02:53 AM   #2 
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Join Date: Jun 2011
Location: Fungus corners
With live plants, the pH can vary through the day---higher at night when the plants have been using C02 all day, and lower in the morning when they've been putting out CO2 all night.

You're well within the expected range, which can be >1.0pH depending on the water hardness (buffering) and amount of plants.
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2.5g, betta, co2, high ph, plant

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