Hello everyone. I have a fully cycled 15-gallon FOWLR tank with 1 clownfish. My gear is an aquaclear 70 (30 impeller) refugium with chaeto, surface and protein skimmer, powerhead, and a heater. I am currently at 0 ammonia, 0 nitrite, and a tiny amount of nitrate that seems to keep going down as the days go on (0-5). My question is what would be a realistic water change schedule. I have fresh water tanks that go up to a month without a water change, is that type of thing realistic for a FOWLR tank?