Wavemaker help for JBJ?

Not a huge problem, still learning how to work this nano 100%. Skimmer is working fine...a lot of disgusting build up. My problem is with Pump #1 on my wavemakers, #1 is blowing out some air bubbles...not a lot but is blowing them out, any idea how to fix it? I tried messing with the seconds, all I know is the lower the sec. are more come out...but after a bit of turning it up it doesn't stop it completely, they're on 45 sec. atm, pump #2 is fine.
 
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