For KNO3/K2SO4, traces etc:

http://tropicalfish.site5.com/tfc/sh...threadid=21359

Old threads:
http://www.aquariacentral.com/forums...&highlight=BGA

"A 3 day blackout cost nothing, works in the same if not less time.
Your problem is one of plant nutrition, not algae. Killing it will not
cause it from coming back.

Clean off what's there, do a 50% water change, add KNO3, at about 1/4
teaspoon per 20 gal. Do a 50% water change when the balckout is over,
add thesame amount of KNO3, and keep adding about this same amount of
KNO3 once or twice a week.
Clean your filter also.

This works and addresses the long term problem.
It also cost nothing to kill the BGA. Hard to argue with FREE.

Your plants are already suffering from a lack of nutrients, the light
will never make or break any tank for 3 days. How do you think they
ship plants?



Regards,
Tom Barr "