Well, I am fairly certain it is incorrect. I know the ml function for fleet does not work and if I enter in .25tsp, which equals ~1ml for a 10 gallon tank I get a PO4 of 26.09ppm. I am certain this is incorrect. Steve Pituch's site has the calculations for dosing fleet. Basically, .3ml fleet is 1ppm in 10 gallons. so there for .25tsp or 1ml should give me a littel over 3ppm in my tank. If your bettar at math than me go to his site and check this.