Sump planning

[target]

Removed the ATO section. Skimmer area is now 11g, return is 12g, and fuge is 16.5g. Leaves me with 26.5g for backflow room. If I put the return nozzle 3" below the underside of the plastic trim I'd have 21g of overflow assuming the water level was right up to the trim, which the sump could handle. But the water level will probably be closer to only 2" of backflow, which would be only 14g of backflow, leaving me a good safety cushion.