As a beginner in this hobby I am often confused reading term "sudden change". Let's say - sudden change in water temperature... How fast it should change and how big amplitude should it be to be considered "sudden"?
Is a change from 78F to 80F over one night to be considered "sudden"? Is 2-degree change noticeable at all to marine fish or invertebrates? How much water temperature changes on the reef from day to night? How much temperature changes in your tanks with a heater going on-off-on-off... ?



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