skimmer ?

[apapas]

my asm isn't producing and bubbles. pump is running fine but no skimate or bubbles inside. what's the problem anyone know

 

[coralreefer]

Is the venturi clogged?

 

[apapas]

don't know how do i check

 

[MattG]

As amy said sounds like the venturi is clogged. blow in the airline and see if it feels restricted. If you havent cleaned the skimmer pump recently id say its a good time for an overnight soak in 100% vinegar.