What, they actually say how to dose Fleet to planted tanks on the bottle? ROFL!
I don't see whats wrong Dogg, thats how you use Chucks to dose Fleet Enema. First off, did it really give you that long decimal? Make sure you get the most up to date version since some previous ones have major errors. Also make sure you use the amount of water you have in your tank, not 55 gallons. (55 x 0.85 = 46.75). Fleet is highly concentrated, and every gallon makes a meaningful difference.
Since Chuck's Calc doesn't have anything for Fleet thats the way we do it. If you want 1 ppm PO4, divide 1 by the answer you got. That's how many mL to dose. Just a note: one drop does NOT equal 1 mL.
So for 47 gallons of water...dose 1.35 mL of Fleet to get 1ppm PO4. Don't know how many drops that equals.