Don't know how big your tanks is but it doesn't really matter how many BPS with the pH controller because the controller will turn the CO2 off when then pH gets down to a set level and you will not have to manually control the CO2 by bubble count. Having said that though I would not have it racing in. I do about 2-3 bubbles per second in my 29 and 3-4 in my 80 gal. The drop check is light green on both and I never have had a problem with gasping fish.
Another reason for not having the count too high is that occasionably a solenoid valve will get stuck open and if the CO2 is running too fast the fish will OD and die pretty quickly. At a slower rate there is a better chance of noticing the fish's state and doing something about it before it is too late.
Hope this makes sense.
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