Why is my coraline turning white?

Discussion in 'Water Chemistry' started by ibefishy, Jan 30, 2010.

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  1. ibefishy

    ibefishy Montipora Capricornis

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    Messages:
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    Location:
    Ca
    PARAMETERS (important)
    Temperature: 80 degrees
    PH: 7.4
    Ammonia: 0 ppm
    Nitrite: 0 ppm
    Nitrate: 0 ppm
    Salinity: 33 ppt
    dKH/KH/Alkalinity: 12 dKH
    Magnesium: 1360
    Calcium: 460 ppm
    Phosphate: 0 ppm
    Test kits you own: API - Salifert Magnesium
    Liquid or Strips: Liquid
    Brand Name: API
    Are they Expired?: NO


    Tank size? 55g
    Estimated total system? 70g

    Reef, fish only or, freshwater? Reef

    Current inhabitants? What and how many? 1 Yellow Tang, 1 Diamond Goby, 1 Firefish
    Clean up crew? 15 Blue leg hermits, 5 Nassarius Snails, 2 Trochus Snails

    How long has your tank been set-up? 2 years

    Substrate.
    Type? Aragonite sand
    Depth? 2"

    Live rock? Yes
    How much? #70
    Did you recently add some? No

    Filtration.
    Type? Live Rock
    Protein skimmer? EuroReef RS80
    Do you wet or dry skim? fairly dry
    Maintenance schedule for filtration? Stir sand while doing water changes
    Drilled tank/hang on back overflow? Drilled Tank
    Sump/refugium. What's in it and how much? 30g sump
    Macro? What kind? Yes Cheato

    Lighting.
    Lighting type? T5
    Age of bulbs? 2 months

    Feeding
    What? Ocean Nutrition flake/ pellets, mysis, cut up shrimp, nori
    How much? just enough to keep everyone alive
    How often everyday?

    Water change schedule.
    How much? 10g
    How often? weekly
    What salt brand? I/O RC
    Water source? RO/DI

    Additives/supplements used? Kent dKH buffer, Coralife calcium, Ion Mag

    Do you have a ground probe? No
    What kind of flow does your tank have? Mag12 return pump thru 3 loc-line returns, 1 Koralia 3, 1 Koralia 2, 1 180gph powerhead

    There are the params for my entire tank as of today. I am trying to figure out why my coraline algae is dying off. It is all turning white. Does anyone see anything that is amiss other than the low pH, and the alk being a touch high? Is it possible that one of the tests didnt come out right?
     
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  3. Peredhil

    Peredhil Giant Squid

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    how stable is your Ca and Mg - does it essentially never budge or does it up and down over time?

    are you talking about coralline that has been added to the tank (i.e. on a frag) or coralline that grew in your tank to begin with?
     
  4. steve wright

    steve wright Super Moderator Staff Member

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    Location:
    shenzhen Guangdong PRC
    ibefishy

    tank is 2 years old T 5 bulbs are 2 months old
    was this an upgrade?

    IME when lighting changes., gets brighter, coralline can die off

    Steve
     
  5. Peredhil

    Peredhil Giant Squid

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    i have a solid purple back wall. it really took off when I kept my Mg stable above 1400.
     
  6. Peredhil

    Peredhil Giant Squid

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    did not notice this. I agree. Particularly if its the coralline higher in the tank/ more exposed.

    How old were the bulbs when they were replaced?

    If they were too old, then even an even bulb swap would be a lot more light.
     
  7. ibefishy

    ibefishy Montipora Capricornis

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    Location:
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    I can only guess that it fluctuates as I manually dose on a weekly basis. The coraline that is dying off is what was there for a while since my tank was set up. I just thought of something...could it be from having to remove all the rocks twice in a two week period to catch some fish I wanted to get rid of. I put the rocks in water while they were out of the tank but would exposure to air for a few minutes be enough to kill it off?

    The T5 bulbs are 2 months old as they are an upgrade from the pc's I was using.
     
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  9. steve wright

    steve wright Super Moderator Staff Member

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    having done the former myself without any noticeable loss of purple
    then my money is on the upgrade from PCs to T5s being the reason
    it will grow again once it adjusts to the new lighting intensity

    Steve
     
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  10. divott

    divott Giant Squid

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    i also noticed since ive replaced my bulbs , and also adding a 6500k , ive had some dieoff on my back glass too. so as said, it could very well be the reason then.
     
  11. Peredhil

    Peredhil Giant Squid

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    bingo!
     
  12. Peredhil

    Peredhil Giant Squid

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    btw - i only have to dose Mg every 2-3 months to keep it stable...