weird sump levels

It sounds to me that Brew12's assessment is correct. I suppose you have a stand pipe in the overflow to which the vinyl tubing is connected on the sump side. Have you asked Charles to take a look at both the standpipe and the vinyl tubing?
 
last time they looked it was algae in the overflow teeth.

If I can find my borescope I need to check out the stand pipe and drain.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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