I have a 140gal planted tank with about 18 plants in it as well as 5 red bellies 2 gold piranha and 3 bushy nose plecos. I am new to planted tanks but i know that disturbing the surface of the water releases CO2, but how are my fish to get oxygen without disturbing the surface? i know that plants release oxygen as they consume CO2, but is it enough? and if my plants stop growing for another reason, will my fish suffocate? Well i bought a powerhead and turned the bubbles on, but im not sure if this was the right thing to do or not... i dont really care for the way the bubbles look swirling all around the tank, but it isnt that big of a deal. how will this effect my plant? it must be bringing in some fresh C02 with the air right?