Coral Community
Reef water chemistry and testing.
guide
A morning pH reading and an evening pH reading can differ even when nothing has been dosed. Time of day is useful measurement context, not a reason to dismiss every change. ## Carbon dioxide connects the cycle Photosynthesis and respiration affect dissolved carbon dioxide, whic…
guide
These three tests describe related parts of seawater chemistry, but they are not three versions of the same number. Understanding the relationship helps prevent unnecessary additives. ## Calcium and alkalinity Stony corals use calcium and carbonate chemistry when building skele…
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Water level and salinity are connected, but they are not the same measurement. A normal-looking waterline can hide an instrument problem or a top-off system doing the wrong thing. ## Follow the water movement Evaporation removes water while leaving most dissolved salts behind. …
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An alkalinity result is more useful when you know how it was measured and what happened around it. A row of numbers from inconsistent tests can look like instability even when the comparison is flawed. ## Build a consistent record Record the test date, result, units and kit or …
guide
If a test reads zero, is the reef thriving? Not necessarily. Corals and their symbiotic organisms need nutrients. Research shows that nutrient limitation and nutrient imbalance can affect corals, but responses vary with species and experimental conditions; this does not establish…
