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Originally Posted by
I have CO2 setup and I want to run a small air pump on a timer opposite
of my lighting schedule to help with aeration. Are there any particular
airstones or diffusers that are better than the rest? Should I put the
airstone or diffuser on the bottom of the tank or is it OK attached via
suction cup a few inches from the surface? Thanks for any input,
Scott
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Most airstones do a fairly similar job so I wouldn't worry whether one does a better job or not. All airstones do is disturb the surface of your aquarium and therefore increase oxygen absorption.
It's common to put airsones at the bottom of your tank or even below the gravel as they aren't always the prettiest of things!!