Plants Pearling Without Co2?

cuticom

Fish Addict
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Hunter Valley, NSW, Australia
I always thought you needed to add Co2 to get plants to let of the air bubbles?

I ahve a little pico set up, with just a small pond plant in it and today it had at least 50 air bubbles over it. Could tis be because of the alage thats also started grwoing in their? I havnt fed the plant or given it Co2 I just top up whatever waters evaporated. This is what I have, theres no fish and it only gets natural sunlight.-
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I was just curious about whether they usually pearl without Co2?

Emma
 

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