My plan is to have the tank water empty into an area thats baffold is 2 inches from the top of the sump, this chamber will have chaeto in it. I am planning for the returning water to stir and swirl the chaeto...
Then when it over flows that baffold there is a flat shelf that's about 6" long with a 1 cm high water stop at the end. In that flat shelf I will set the 3-4 4" holes for socks so water can just flow down into the sock into the next chamber. If it over flows it needs the 1 cm of flow to go over the water stop and overflow into the next chamber unfiltered....
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