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normally Potassium deficiency, you hear about it more in plants. It can cause all sorts of problems, yellowing leaves, stunted growth, poor coloration, and the list goes on. Potassium is also the chemical that flowering shrubs and trees use the most of next to nitrogen. Not to mention, it is the prime element they use for healthy root development. I can see how it may relate to coral a bit, as it does in humans.
Also.. most iodine solutions are actually Potassium Iodide... so, i think that the chemical may be present in makeup water... try more frequent waterchanges Hoang... smaller, but more frequent.
Also, aren't those the same symptoms of most people who are having trouble with their SPS? LOL
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