Have you tried to clean out the silencer on the air intake I usually run water through mine then blow it out. I have 2 bubbleking supermarine 200's and when ours do this cleaning it will usually help.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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