One baffle will regulate water level. Over under are just to weed out microbubbles.
Mine was socks and skimmer, one over baffle, fuge, over under over baffles, return pump.
I had the dumb idea to use thin acrylic hooked to glass. Acrylic buckled, silicone held, glass tank gave way. Fun stuff haha.
Don't know how I ended up on this thread but I did.
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