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silica and algae growth



hello...

my LFS has all but insisted i use my "tap water purifier" DI unit to do water 
changes because they say there is Silica (and a bit Phosphorous) in the tap 
water and this will cause an algae bloom. Anyone have an opinion on silica as 
it effect algae growth?

alos, if i use the DI water, which is the best "bottled mineral" solution to 
add the necessary minerals back into the water for the plants and fish?

-john guild