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I have never used the night sensor, never saw a benefit. I have the wp25 series but believe it's the same for the night sensor. Try shining a flashlight on it and then off, see if it works that way. The wp series had some faulty sensors if I recall..the night mode I turned mine on have the yellow light showing on the panel but it dosent seem to change any
I have two of them in my 40. Currently they're running on constant mode speed 5I used 2 rw-8 on my 55 gallons for a few months and they were stronger than I wanted. I could only use 1 mode and they switch back and forth. Both runs at the same time would cause too much flow for my 55 gallons. They were good IMO. don't know long term usage. Many people I know like them btw
I have two of them in my 40. Currently they're running on constant mode speed 5