An easy way might be to order one from bulkreefsupply http://www.bulkreefsupply.com/store/...overflow-boxes otherwise I would make one out of acrylic.
I used black acrylic and used silicone to attach it to the glass, I roughed the edge of the acrylic and siliconed both inside and outside seams.
http://www.canreef.com/vbulletin/sho...t=57242&page=4
-Joe
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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