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Ok, I had to post this, as I have never seen it asked about, nor have I been able to find anything about it using the search.

In my planted tank, mild to heavy planted, I have DIY co2. I used to have the bubbles go straight into the intake tube of the filter, but recent re-arranging of the plants, caused a movement of the glass diffuser.

When I got everything settled back down, I noticed that some of the micro bubbles make it all the way up to the top of the water. When enough of those mirco-bubbles form at the top, I noticed my black molly goes over and chomps on them!

Should I be concerned? I've never heard of fish eating co2 like that! I have strange fish!
 

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I've often seen my guppies doing this. It doesn't seem to hurt anything. I Think of it like someone is breathing in your face. It won't kill you, but it may be a little uncomfortable if they have bad breath. :)
 
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