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Old 03-12-2013, 10:56 PM   #1
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I am due for a PWC. I've been doing them every week. 75 gallon tank and 25 gallons every 7-8 days. We went camping over the weekend so I'm at about 10 days past my last change. I just tested the water and everything seems fine. Is once a week too much or is it more of a preventative change? We only have 2 clowns, one blue tang, one eng goby, about 20 red leg hermits and 5 margarita pink snails. Just curious.


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Phosphate was .25
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Old 03-12-2013, 11:24 PM   #2
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33% every week is probably a bit on the high side. Consensus seems more like 10%. But your nitrates would climb.
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Old 03-12-2013, 11:24 PM   #3
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I started off doing them that much, now I'm every 14 days or so. Depends on your set up- skimmer, refugium, etc. I'm just hob filter and skimmer on my 30g with 2 clowns, goby, and mandarin. No real algae build up. It's all personal preference on how clean you want your tank and how good you want your water quality for your livestock.
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Old 03-13-2013, 12:14 AM   #4
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My thinking was since its a 75 gallon tank plus 20 gallon sump that would be 95 gallons total. I also didn't factor in the rock and sand (which prob negates the sump). Seems like everything I read is a bit different. I've read 10% and 20%, every week, two weeks and even every month. Guess its just how your tank looks and water quality. Thanks for the input.
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Old 03-13-2013, 12:27 AM   #5
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There are two main factors when talking about SW water changes. First is the obvious, nutrient export. Your tank given you keep a strict feeding regime will give you a measurable amount of nitrates/phosphates per week to give you a pattern which you would then just do the math to figure out how much and how often you would need to do your water changes. The second factor is mainly only concern for reefs but it is mineral replenishment. When keeping corals they will deplete your alkalinity and calcium which this to can be measured to give you an idea of the rate its used allowing you to A) begin dosing to combat that, or B) replenish the needed minerals though water changes. That being said you need to remember every single tank is different so what I do for my tank may not work for yours so you need to just monitor it and find its trend. Then you can fine tune your schedule and make it more efficient
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Old 03-13-2013, 12:36 AM   #6
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Well said! I appreciate that! Makes tons of sense.
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