I think bubbles in either fresh or salt spoil the whole affect (personal choice) once a day (irregular) i will flow air through my power heads, i did read and believe this to be true that the bubbles keep the water clear, plus the damsels love it. actually i smash all my tanks with power filter bubbles.
i run under gravel filters in some tanks too, so i need stones (fine), 2 have power head on them and i am trialing this one- i run a bleeder hose from a under gravel spout through my drip tray, seems to be ok, is it?