okay so i am still getting one of either GSA or GDA not sure what type again i shall try and get some better pictures for you all, i am not sure i have upped my co2 ever so slightly even tho my drop checker show lime green all over the tank bba is non exsistent so i am happy its been delt with, this stuff only appears on the front glass i have increased my ferts so i am conftable that its not a lack of fert issue altho if its GSA it may still be low phosphate