Water Chemistry
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pH in the Reef Tank: Why It Matters, What Goes Wrong, and How to Fix It
What pH actually does in a reef tank, why yours is probably lower than you think, and the four fixes that genuinely work — fresh air, CO2 scrubbers, kalkwasser and a reverse-photoperiod refugium.
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Reef Tank Water Parameters: The Numbers That Actually Matter
Salinity, alkalinity, calcium, magnesium, nitrate, phosphate — the real target numbers, how often to test, and which ones corals punish you for ignoring.
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Reef Dosing Explained: 2-Part, 4-Part, Kalkwasser & the Moonshiner’s Method
As soon as a tank has real coral biomass in it, water changes alone often can’t replace calcium and alkalinity as fast as growing corals consume them — that’s the point where dosing enters the picture. There are several ways to do it, from simple two-part liquids to fully automated calcium reactors to a method…
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Water Changes: How Much, How Often, and Why Twice a Month Beats Once
Water changes are the one piece of reef maintenance nothing else replaces — no skimmer, refugium, or dosing routine fully substitutes for physically removing old water and putting in fresh. The question isn’t really whether to do them, it’s how much and how often. And the answer is almost always: less at a time, more…
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How Often to Test Your Reef Tank (and Why It’s Non-Negotiable)
Corals and fish can’t tell you when something’s drifting out of range — by the time you can see a problem, it’s usually already been building for days or weeks. Testing is the only real window you have into what’s actually happening in your water, and how often you test matters just as much as…
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Reef Tank Water Chemistry for Beginners: Salinity, Alkalinity, Calcium & More
Once your tank is cycled, water chemistry is what keeps it stable long-term. None of these numbers matter in isolation — what matters is consistency. Here’s what each parameter actually does, the ranges we target, and when to test for it. Salinity The Purpose of an ATO Alkalinity Calcium Magnesium Trace & Macro Elements Nitrate…
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How to Cycle a Saltwater Reef Tank: The No-Guesswork Guide
What cycling actually is, what the ammonia-nitrite-nitrate curve looks like, how long it really takes by starting method, and the mistakes that restart the clock.