The way I set mine up was to get a measuring cup and physicaly measure the amount of output in one minuit. for your case 75 ml / min is the same as 1/3rd of a cup in one minuit. once you get this flow rate stable then slowly start increasing your bubble rate on your CO2 untill the out put PH of your reactor is aprox 6.8 then you can fine tune from that point.
This is whare I leave mine and it works for me.. depending on volume and "other" tank factors you minght nheed more or less CO2.
Darren had a way of setting by using alkalinity but for some reason it didn't for my tank but it has for others.. basicly take what people say (Including myself) and use it as a reference to start at then fine tune your tank to what works for you.
Darren is also spot on with the denitrifacation happening in your reactor.. sulpher is a by product of anarobic activity in both salt water and fresh water tanks.. thats why you can buy sulpher denitraters and such. this is also what makes dead spots in your substrate stink.
Steve
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