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Thanks for the help. That is all it took.

The output tube was not out of the water. I will try that later. Thanks for the advise but I don't know that it will make a difference as it was doing the same thing even when I filled the filter manually with water then turned it on.

I have an Eheim 2078 that has been a great filter until I disconnected it to tear my tank down and replace all the substrate and start over fresh. I had a Cyanobacteria issue. I was advised by my LFS to bleach the tank after I tore it down. I used a 10:1 solution (water:bleach). After...