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Old 02-10-2013, 03:02 PM   #1
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A colony of white spots just appeared on live rock

I have no clue what these white spots are which appeared about 2 days ago. I started using the Reef Crystals salt by Instant Ocean about a week ago. Before that was just the Sea Salt. My dKH was too high a week before with low carbonate of 360 so I replaced 25% water and added B-Ionic Calcium Buffer 1 & 2. Other parameters are PH=8.2 Nitrate=15 Phospate=0 Sp.G=1.025 Temp=78.
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Old 02-10-2013, 03:08 PM   #2
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Looks like calc worms
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Old 02-10-2013, 03:14 PM   #3
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They're a type of worm that looks like a feather duster, eventually you'll catch one that has its "feathers" out, they're red if I remember right. They're completely harmless, I've had them in my tank for 4+ years and they come and go.
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Old 02-10-2013, 03:22 PM   #4
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Appear to be spirorbid worms to me. As jeffer stated, harmless, and they come and go. More info here:

Xtalreef - Reef Saltwater Aquarium
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Old 02-10-2013, 03:35 PM   #5
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If they are all true then I am excited to have more unexpected creatures in my tank. It's just surprising they suddenly sprouted so many in same spot. Few are spread out singly on other rocks.
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