Anyone have success blocking Refugium light spill?

I get minimal light spill with this setup


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Similar setup here... had algae in my skimmer.
Picked up a sheet of black acrylic, cut it to size and used it to block the light. Works like a charm! No more algae in my skimmer.
 
I just hung up 2 pieces of black foam and that blocked out all the light from my skimmer and return pump.
 

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