The Ehiem air stones are good, adjustable and will give you micro bubbles on the fine setting.
What about wooden airstones?
Adjustable?
Jumps out of bed to investigate.....
Ed, thanks for the guidance. What's the logic behind mainly nitrogen bubbles?
I wanted smaller bubbles as the tank is small and to disturb surface a little to break up slight surface scum and improve O2 exchange in water given there are shrimps in there, ps and I love the diffusers so aesthetic aspect to it too
Atmosphere of Earth - Wikipedia, the free encyclopedia
Air is 78% Nitrogen, 21% Oxygen and around 1% of everything else.
(Sheepish....), everyday is a school day.
Sounds like you just need a small fine air stone.