Hello- I have 4 bubbler's that get CO2 injection both above and below the rock's because i've noticed good results when I spray O2 inside the bubbler(root zone) the thing is that 3 of my cheap pump's died all at once but i'm still spraying the roots with O2 do I still need air pumps? this is only the second day and so far so good but bubblers can go down hill in a hurry so i'm trying to be safe by getting advice from all you learned types. Thanks