dust like brown alge

Discussion in 'Nuisance Algae' started by srecho, 13 Feb 2019.

  1. srecho

    srecho

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    help needed to combat dust brown diatoms- alge
    2 month ago notice small paches of brown coloring on sand and live rocks.
    dit not take to much notice for a while then more and more start apering all over a tank

    start brushing it off from rocks and for a while all looks good then one fish dissappear but corals do not look to happy zoas where the first to start going down and gone.
    last couple of days the tank looks more like painted darkish brown
    at the same time 3 dartfire fish are not seen anymore, corals are now
    completly closed
    they never looks so bad since the tank was startet 2012 change 150l of water twice in 2 weeks Tank is 800 l inc sump The way things are going at the moment i will lose number of corals
    What surprises me that i dit not change anything out of routine
    What happens ?
     
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  3. noobsw

    noobsw

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    Add a picture. Could by cyano?
     
  4. 2una

    2una

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    You have DI stage on your RO unit & been changing it when its been getting exhausted?
     
  5. 2una

    2una

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    Sorry ignore above, you brought this up before in another thread, i didn't realise it was you posting this again.

    DI stage that you don't run will mop up excess metals that make it thru the membrane, plus silicates.
    Increase of silicates is quite possibly the brown issue you have - excess metals building up is quite possible why your zoas are closing.
    Change as much water as you like, if the source is the problem its not going to fix anything.
     
  6. OP
    srecho

    srecho

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    I have replaced 2 units of 5 micron filter, could not get2 micron filter and carbon filter. Have also instal DI granulets filter after membrane
    Also check old water in top up drum it was showing on TDS tester 000 then throw it away and replace it with new water ,it also show 000n TDS
    Iwill also buy tomorrow silica test and see what is happening. Was reading somewhere that diatoms are absorbing silica when present in the
    water.So to much silica to much diatoms? corect?
     
  7. 2una

    2una

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    Can be yes , I've also seen guys reporting zinc + silicate getting thru even with 0 tds.
    The di will be likely to stop it but stay on top of it, don't run to top up drum with resin that's all changed colour as then it's not absorbing anymore & can start to release.
    I actually gone to a normal 10inch filter insert of di resin with mine as it holds x3 of the normal size DI pods.
     
  8. OP
    srecho

    srecho

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    The pet shop does not sale silica test kit, for now i bought Phosguard will let you know how it works. Will take my water to be tested to pet shop
     

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