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I am currently cycling my tank, and doing a fishless cycle, and will be also slowly adding plants while I am at it. I am wanting the plants to grow as much as possible in the time before I get the fish in, and I was thinking of doing CO2 injection while the plants are new, to help get them established.

The only trouble is that the filter I am cycling is a sponge filter that makes the water on top a little choppy. I know that this is not recommended for a CO2 setup, but will the CO2 still have some (diminished) benifit to the plants?

It is a 10 gallon tank and I'm using a DIY yeast method CO2 with a chopstick diffuser.
 

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I'm wondering the same!

Edit: Also if it is beneficial and I have a glass lid, how much space would I need in the back of the tank for ventilation? Or is it just not advisable with betta? My idea is to have the glass sliding lid and leave an inch or so without glass in the back, and over that put the embroidery plastic canvas so they wont jump. Is that enough to vent out the CO2?
 
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