this tank had 2 reef ready corner over flows that I took out. I resealed the tank and reinstalled the center brace. installed drains on the bottom. plumbed returns inside the tank. I wish I would have made these into 2 more drains though. home made wet dry with 180 pot scrubbers. the 2 sumps are rated to hold 400lbs each so they should last for a while. no leaks yet. got a mag12 return pump. When the water level goes below the cross on the back it quits draining. also have a diy surface skimmer.
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