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Old 16-01-2007, 08:30 PM   #4
the_r0ck
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Bubbles per second is not really a scientifc way and its not part of the pH/KH chart. The pH/KH chart determines how much CO2 you have in the water while the BPS basically tells you how much you are putting in.

2BPS for 2 tanks of the same dimensions but different introduction method, i.e. one is using flipper and the other using a diffusor will have different CO2 ppm readings. Aim for a consisitent ~30-35ppm reading.

Observation wise for tanks with ADA soil means that you just slowly increase the bps until you see signs of stress (or worse, even death). There will never be any hard and fast rule on how much exactly one should use. Its always a case by case basis. So when people tell you that you should always use a certain setting (say, 2bps for a 3 footer tank), ignore the person. Its a good general guide but never exact and never the same for 2 tanks.

-Calvin
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