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[APD] Re: H3PO4 and Green spot algae

Tom Barr said

"But more convincingly.............H3PO4 is used for "pH down" (or was) at 30% and has been used extensively in planted tanks and at relatively higher concentrations, perhaps not like a dip.......................but the residual leftovers left in the tank itself should not cause any issues and should help, not harm the plants, since the green spot appears to be related to lower PO4 limitations in planted tanks.

This method might be faster for Anubias clean up than waiting for the GS to go away with improved environmental conditions through better CO2/PO4 additions. Additions of PO4 at higher levels and good CO2 levels will remove Green spot in a  week or two and prevent it from coming back. Both methods involve a plant fertilizer that at low limiting levels, is associated with GS presence."

To work rapidly _less than 30 seconds_ the acid needs to be concentrated. I used 87% H3PO4. I believe the 75% grade commonly used for horticulture fertigation would give similar results, but the 30% 'PH down' phosphoric acid would probably not have the [H+] 'punch' required to the job. However only experimentation will tell.

With the 87% grade I used 1ml/(2-4) 'nana' leaves per day, per 200 Litres water. ie One day I would treat 3 leaves, the next..another 3 etc. I did not treat all the leaves at once to avoid any problems with pH or KH. Then a routine 20% water replacement at the end of the week. The whole bank of plants was 'polished' in a couple of weeks.

As Tom states a high Phosphate and CO2 concentration helps avoid subsequent colonisation/growth of greenspot. But to be honest I have to point out that I could not kill off existing populations by simply increasing just these two factors. And considering the rate at which my Glosso is growing I would not say that I have an inbalance in the fertilisation. There might be other factors involved in the removal of greenspot, apart from phosphate and CO2. I believe species of alga and temperature are another two.  

Best regards

Stephan Mifsud

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