09-09-2008, 07:25 PM
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Mineral Supplements: How much is too much? Too little?
I have a rock covered in Pulsing Xenia, and a Galaxea coral, and I read the Xenia needs Calcium and Iodine, while the Galaxea needs Strontium. I bought a bottle of Iodide, Liquid Calcium, and Strontium & Molybdenum (All Kent Marine, if that makes any difference), and read to dose the Strontium and Molybdenum with 5ml every 4 days in my 44gal (With the refugium, it comes out to about 50gal), the Calcium says "1/4 to 1 teaspoon per 50 gallons each day, based on animal load", and the Iodide says "Add 5ml (1tsp) per 50 gallons every week, or 8 drops per 50 gallons every day, daily dosing is the preferred method."
I've read around, and it says that excessive iodine can harm invertebrates, and this 8 drops (Probably 8ml) per day seems a little excessive to me.
I think I'll keep with 5ml of calcium and iodine per week for the time being (I'm also buffering the pH up to 8.3 so that'll add more calcium for the corals), and 5ml of strontium every 4 days until I hear that once a day isn't dangerous to anyone in my tank.