I am dosing vodka. My nitrates have been zero but I have been having issues with phosphates. I have increased my dosage to 5ml on a 100gal total system volume but no effect on the algae in my tank. I really don't want to bump my vodka dosage any more since I have zero nitrates. I just got a bottle of SeaKlear phosphate remover for pools today. I dosed 1 ml today to start and will see if it works.
On a side not the phosphate remover came with a trial bottle of Natural Clarifier. I wonder if this would work on aquariums also. Here is the info on it:
http://www.waterwarehouse.com/pdfs/2984.pdf It is all natural and the major active ingredient is chitosan which is the structural element in the exoskeleton of crustaceans. Here is an article on it where someone actually drinks some to show how harmless it is:
http://seattletimes.nwsource.com/htm...lreport23.html