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tunze 9002 not producing bubbles

i just setup a tunze 9002 and it's not producing any bubbles within the body of the skimmer. i fully opened and closed the airtube figuring no air was getting to the pump to produce. no go. i guess i'll have to take it apart. any suggestions?
 
Adjust the light blue dial or make sure the tubing is firmly attached to the pump. My skimmer wasn't working for awhile an I found out the tubing came loose...if that doesn't work you can take the skimmer apart and give the pump and body a vinegar bath
 
- vinegar:water solution
- shorten the tubing

a week and a half later it's making it's way through the break-in process. got a little bit of very wet skimmate in the collection cup. but atleast i know it's working.
 
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