
I have 12 nozzles (in multiple tanks, not all in one tank). Purple is all my favorites. I can feed a whole leaf and in 5 minutes or less it's gone. Green or brown algae (as well as a variety of grocery stores) take 30 minutes or more before disappearing.

12 Count Greenpro Root Tabs Fertilizer Tablets: Ideal For Aquariums, Ponds & Water Gardens!
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