eh, water changes are overrated, I kid, I kid...
I'd say it depends on the bioload of your system and whether you have a refugium or not. Experts agree on 10% weekly but can be more to correct problems if such exist.
Remember, each system is different; if you have a lot of fish, more water changes will be required to keep everything happy.
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There comes a time in this hobby when it's just cheaper to silicone around the windows.
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