Ive never dosed phosphate but anything gradual like that I believe would be a great idea.I've been dosing silicates for about 3 maybe 4 weeks now. I just made up a solution to dose phosphates today. I'm not really sure how high I should be dosing phosphate. I only have one nem and a few fish, other than snails and crabs. I figured I'd start off with .01ppm phosphate a week and go from there.