DIY co2 for fifteen gallon tank - The Planted Tank Forum
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post #1 of 3 (permalink) Old 02-21-2013, 01:23 AM Thread Starter
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DIY co2 for fifteen gallon tank

My plan with the co2 is to grab 2 two liter pop bottles and create the yeast/sugar concoction in both. I'm thinking that perhaps this will create plenty of co2 in the aquarium for the plants. I will take both tubes from each bottle and join them together to one tube going to the diffuser in the aquarium. I'll just use one of those nano glass diffusers. Now, the other reason why I like the idea of 2 two liter bottles is because I will create a new yeast/sugar mix in one bottle each week-keeping the co2 going and keeping it consistent. But because the mix takes about 24 hours to start creating co2 I might add some excel with the one bottle for a couple of days while the new bottle brews to compensate for the one brewing.

What do you guys think, will using two 2 liter bottles add more than 1bps to the 15 gallon thus creating more co2 than just using one bottle?

Because there will be no fish in this aquarium I not worried about too much co2. But will adding excel with the one bottle while the other brews new co2 every week keep the consistency?
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post #2 of 3 (permalink) Old 02-21-2013, 02:16 AM
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I've had a similar set-up on a 10 gallon. Two 1.75 liter bottles connected to a diffuser in the same fashion, and alternating new batches between the bottles every week. It worked well. You can always use a 3rd bottle to start the new mix 24 hours before you intend on switching out an old batch, eliminating any down time of CO2 production. Avoid using only one bottle if you are trying to keep consistent CO2 levels. If you're worried about producing too much CO2, simply add less sugar to your mix. You can use Excel to supplement if you'd like, but if you're diligent about following your schedule it's an unnecessary additional cost. Pure CO2 is far more effective than Excel in my experience.
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post #3 of 3 (permalink) Old 02-21-2013, 02:21 AM Thread Starter
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Cool I'm glad that it worked for you. So when I make the third bottle to replace one before hand should I leave a hole in the cap of the bottle so it wont blow up or will that release too much co2? Plus I'm not worried about how much co2 I produce because there will only be plants in there.
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