How can a Durso overflow can suddenly stop working?

wojo

New member
hey guys, i have the other thread where i was asking opinions on how to make it quiet so i was making some mods in my sump to get rid of bubbles, i was unable to so i went back to the setup i have been running for a week and now the overflow will not function

simply it fails to take the air in the pipe and chokes, if i would let it run it would overflow my tank....

this is the setup that was working fine for the past week and now it doesnt work? i mean nothing changed, same pump, same pipes, everything...

can you please help :confused:
 
thank you eleohen, there is one down there, wow

how do i get it out and how to prevent it from happeneing in the fuuture?

thanks
 
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