No actually I quit using pH 7.0 about 6 months ago. I saw a post about
phosphate buffers and sure enough.... the stuff was a phosphate buffer.
Currently I use NO chemicals at all and about 1 teaspoon of phosphate
free carbon (Black Diamond) in only one of the filters. I am doing a
30% water change with a vacuum every Saturday just to stay ahead of the
BGA while I try different things. I am going to test my tap (well)
water tonight, thank you. I have tried blackout... it works but only
temporarily. My problem is pretty advanced. In 3-4 days I have a good
covering, primarily on the right side of the tank. This is the side
with only two java ferns and the whisper filter. My plants are
primarily on the left. I would say my tank maintenence is pretty good
although I am still learning. I will NOT start the tank over. What will
I learn from that? It may very well be coming from my tap water....
that'll be great.

my aquarium page, info and pics at:
www.geocities.com/spiral_72/Spirals_page.html