After doing more research and figuring out my needs I decided to go with egg crate baffles which would support Poret reticulated foam.
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The mechanical filtration will be with 10 PPI foam then a fluidized K1 section and then 30 PPI foam before the pump chamber.
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Since K1 is smaller than the egg crate fenestrations I zip tied plastic mesh to the tops of the baffles to let water (but not K1) flow through in case the foam clogs.
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The foam is arriving today from Swiss tropicals and also my plastic tubing so I can plumb this thing.
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The mechanical filtration will be with 10 PPI foam then a fluidized K1 section and then 30 PPI foam before the pump chamber.
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Since K1 is smaller than the egg crate fenestrations I zip tied plastic mesh to the tops of the baffles to let water (but not K1) flow through in case the foam clogs.

The foam is arriving today from Swiss tropicals and also my plastic tubing so I can plumb this thing.