Reefer Matt
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It depends on your equipment, tank conditions, and lifestyle. I change about 120 gallons a month. Why? Because I don’t mind the maintenance, and the nitrates are always higher. My tanks always look better after water changes too. I always advocate for water changes, especially when an unknown problem arrises. A lot of times, it “resets” the tank. But as they say, “your mileage may vary”.