Persistent GSA/ GDA

Discussion in 'Algae' started by Spider Pig, 11 Dec 2008.

  1. Spider Pig

    Spider Pig Member

    18 Mar 2008
    Have had my tank set up in it's current incarnation for about 6 months now but still having problems with GSA on leaves and glass, and GDA on the glass.

    Currently dosing 2 x EI using PMDD+PO4 formula:
    "This is an example of EI for a 12 week supply for a 20 gallon tank for those with teaspoon adversion.

    To 1 liter of DI water add:

    60 grams KNO3
    10 grams of KH2PO4
    25 grams of GH booster

    Add 5 mls daily."

    So using 20ml/ day for a 180L tank. Use flourish 2 x /week. The reason I upped the dose was that I noticed a big burst in growth after a trim and the nitrate tested as 0 even with 1.5 x EI. Now it is 10ppm before WC
    50% WC weekly. Admittedly I missed a couple of these a month ago but have been more rigorous with tank hygiene the last few changes.

    CO2 is on 3 hrs before lights on and off 2 hrs before lights off. I usually have it at light green (pH6.4- 4kDH solution in drop checker) Although this is equivalent to a co2 of 50ppm odd, I haven't seen any adverse effects on my fish.
    he only thing I can think of is flow. This might be a problem as the tank is quite heavily planted in the back right corner and although the juwel filter intake is positioned there, I don't think the flow is too great through the undergrowth. Planning a rescape in the new year to thin things out a bit.

    Any other suggestions?

  2. JohnC

    JohnC Member

    14 Nov 2008
    On a mountain in the Highlands of Scotland

    I had managed to nail all the algae in my main tank except Green Spot on the leaves of my slower growing plants.

    I knew the phosphates were not the issue as the levels in my tap water are between 5ppm and 9ppm, i was thinking variations in CO2 could be the issue as my supply isnt the best and i use a ph monitor (not good) for now.

    I am waiting on a DIY reactor from Ed to sort that out but i have managed to sort my filter which was a Fluval 205 on a 174L tank, upgrading to a 405.

    Now i don't have GSA. So in my case it was flow. Get a powerhead for your jungle. :D

    I'm happy.

    Best Regards,

  3. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

    11 Jul 2007
    Chicago, USA
    It's extremely unlikely that you have 50ppm CO2. Slowly add more along with more flow...


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