Depends on what the hole is for. If it is for a closed loop just a strainer, if it is for the sump I would put an overflow so that you can maintain the water level in your tank above the hole.
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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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