Randy Holmes-Farley
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My Tank Thread
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Reef Chemistry Question of the Day #97
Many chemicals are depleted from the water in reef aquaria by the organisms living in them, and responding to that depletion is an important part of tank care. Recognizing what measured results are impossible and must be testing error is also an important part of the learning curve for a reefer.
Take our friend Julie. She was monitoring her tank closely for a few days. She took two measurements 36 hours apart. She dosed nothing in between, and did no water changes. She was a little confused by her results.
Which of the following of her measurements is the least likely change to have actually taken place in her reef aquarium during this time?
A. Calcium declined by 5%
B. Magnesium declined by 5%
C. Hydrogen ion (H+) declined by 50%
D. Alkalinity declined by 25%
Good luck!
.
Many chemicals are depleted from the water in reef aquaria by the organisms living in them, and responding to that depletion is an important part of tank care. Recognizing what measured results are impossible and must be testing error is also an important part of the learning curve for a reefer.
Take our friend Julie. She was monitoring her tank closely for a few days. She took two measurements 36 hours apart. She dosed nothing in between, and did no water changes. She was a little confused by her results.
Which of the following of her measurements is the least likely change to have actually taken place in her reef aquarium during this time?
A. Calcium declined by 5%
B. Magnesium declined by 5%
C. Hydrogen ion (H+) declined by 50%
D. Alkalinity declined by 25%
Good luck!
.
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