I have one question. I did a reading site ( http://sites.google.com/site/aquaticplantfertilizer/home/pps-classic ) , and the typical daily dosing for one tank 300L (75 Gal) is 18 drop (0.9 ml )and if you read the details section TE ( http://sites.google.com/site/aquaticplantfertilizer/config/app/images/02.04.TE.pdf?attredirects=0 ) the document indicates a different dose for 75 Gallon => TE 7,5 Ml daily . I don't understand very well, if you can help me !!