It is a perfect 1/4 circle and is 7 7/16ths radius. If the acrylic is 1/4" or less than these are good measurements. Otherwise it would need to sit on top of my rim.
I'm trying to avoid salt creep from both my return in my overflow i guess, if I drop the water level it will get a louder. There is a hole in the elbow of my return to relieve water siphoning back in to my sump.
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