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Old 08-07-2012, 03:55 PM   #1
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Crab

Do emerald crabs eat the good stuff of your live rock the purple and white stuff that was on the rock seems to be dissapering on mine
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Old 08-07-2012, 04:03 PM   #2
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Sounds like a calcium depletion to me. What are your calcium levels?
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Old 08-07-2012, 04:26 PM   #3
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Do you have an urchin? Because they definitely do.
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Old 08-07-2012, 05:15 PM   #4
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No urchins not tested for calcium the kit I've got doesn't have the test do I need to check that no corals yet
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Old 08-07-2012, 05:23 PM   #5
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Regular water changes add more than enough calcium back into the tank with corals, let alone without.
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Old 08-07-2012, 05:27 PM   #6
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I've got a bunch of emeralds and have never seen them eat coralline. They generally just dig at the green algae in my tanks.

Could be calcium or essential elements, how often do you do water changes and how much volume?
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Old 08-07-2012, 05:30 PM   #7
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I do water change every 2weeks 20 percent I'm due one but put 3 fish in tank my first fish will it be ok to do water change
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Old 08-07-2012, 05:43 PM   #8
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I'd wait a day or two if you just added the fish, don't want to stress them out before they can get accustomed to the tank.

If you are regularly doing water changes i don't see that as being the issue with your coralline algae receding, the tank is getting enough calcium and elements with the water changes.
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Old 08-07-2012, 06:36 PM   #9
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Well, white coraline means it's dying or dead. If you would test for calcium at your LFS, we could nip that in the bud right away. But if you're doing regular water changes like you said, calcium shouldn't be a problem. Have you changed your lighting at all? Photo period or intensity? Also, how hot does your tank get?
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Old 08-08-2012, 02:02 AM   #10
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I've noticed if you expose coralline algae to air just for a few minutes sometimes it will die and turn white. So if you recently exposed it to air that could have turned it white.
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