I can't recommend a good air stone as I don't use them. However, I do know
a major difference between the air stones is how well the stone stays
together and how well the plastic coupler stays together. In the past I
have had trouble with the stone slowly falling apart and the plastic coupler
breaking away from the stone. Both of these greatly decrease the number of
bubbles and therefore the total surface area of them. So I ended up
replacing the air stone frequently to get good results. I would think there
are some high quality air stones made of a material which won't have these
issues.


"Aqua Essentials" wrote in
message ...

Wrote:
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

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!!


--
Aqua Essentials