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First time sump, chamber to left of red line is skimmer….. chamber to the right refugiumWhy so high? Are you using it for a refugium? Will you have a skimmer in there? That will dictate a proper level for skimmer operation. I usually run my pumps just over the return pump, usually no more than half full....you need empty space for back feed of display water during a power outtage.
Sure...but have your gear in there as well before that test.Just getting info off YouTube… said to fill display till water starts to go down drain into sump and stop…. Then fill sump to top ish… then put return pump on and sump level will drop… then shouldn’t get any flood…
If there’s a better way let me know again new to sump’s
Using Red Sea 600Sure...but have your gear in there as well before that test.
What is the operating height of your skimmer? Mine needs about 7 to 8 inches of water depth, any higher and the skimmer floods and WILL flood during a power outtage when the level reaches the top of my sump.
It’s a custom tank build, no water fill line that I can seeThe sump should have water level marking points on it so you know what level to fill to

Both can affect the sump but primarily use the valve. If you are running the pump to high it will drain the sump because the natural overflow down can't keep up.And I adjust the sump height by valve on my drain? Or slow the return pump down?