It depends. If you nozzles for your return are below water surface they will drain until air is let into the pipe to break the siphon. Unplug your return and see how much of your display drains to give yourself an idea.
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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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