The first baffle is sealed at the bottom & the water cascades over the top. That way, the water level is always the same height.
If the first baffle is raised, then the water goes out below & the water level will change as water evaporates.
My sump has 2 baffles. The first forces water over, the second pulls water under & into the chamber with the return pumps.
First chamber - Skimmer section. The middle chamber is largest, with macro & frags. Last chamber is smallest, for return pumps.
Anthony
PS. I'll post pics later.
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