Hummmmmmmmm

[MermaidMel]

It's humming! Do lights hum when they are running out? I think I heard that?

 

[SkiFletch]

They usually do humm when nearing the end of their life. Does the humming stop when the bulbs are turned off?

 

[MermaidMel]

They usually do humm when nearing the end of their life. Does the humming stop when the bulbs are turned off?

No

 

[SkiFletch]

Well then it's probably a powerhead, powerfilter, external filter, soemthing with a moving part

 

[doresy]

in aquaones sometimes moving the spray bar one way or the other can produce and stop the humming