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Nuking BGA

Hello to everyone.I have a 65 gallon tank that had BGA about six months ago 
which I sucessfully treated with erythromycin. I guess I was not aware of the 
underlying cause that started it and it is back.I think I finally have the nutrient 
balance down now but the BGA is stll here to stay regardless. I am positive it is 
Blue-Green Algae which I know is actually a gram negative bacteria. I tried using 
the erythro. again but the bacteria are now resistant to it because I possibly did 
not complete the full dosage the first time. I also tried using hydrogen peroxide at 
different dosages for several days on a couple of occassions. I would to get rid it 
for good because it is getting worse daily. My iron is about .1, nitrate about 4.4, 
gh about 7deg., kh 4deg. I dose tropica master grow at about 25ml a week. I also 
add a little KNO3(1/4 tsp. weekly) along with Seachem's potassium supplement(14 
ml a week.). I temporarily stopped the fertilization while the problem exists. The 
plants and fish all seem to be fine also. I do water changes every two weeks and 
change 20 gallons with reconstituted RO water(I use the seachem equilibrium, acid 
buffer and alkaline buffer). My PH is about 6.8 controlled by automatic  CO2 
injection. I have read up on using potassium permangenate on the krib and from 
the archives of this list and have purchased some online. I am not sure of duration 
of treatment though .  Because of all the warnings I have read  I know the dangers 
behind this product. I found information on the web about dosage for using 1/8 
grain to the gallon which I have been using for the past week (I figured a dosage 
of .486 grams) but the BGA has only been getting slightly better.I dose once daily 
,diluted with R.O. water. My water now is also a little cloudy but it may be from a 
green water outbreak or the nitrifing bacteria dying also(I tested for nitrite and it 
was zero). After I add the potassium permangenate the water only stays purple for 
a couple of hours and then goes back to being cloudy so it may be exhausting 
itself prematurely because of other organics in the tank.  I thought a product like 
that would rid the bacteria in no time. I just wanted to know if anyone could give 
me clear advice on dosage and duration of potassium permangenate in a planted 
aquarium from their own experiences. Thanks for any help.