For the rotala butterfly calculator, how accurate is that? I'm reading for a 20g to dose 1/16 tsp KH2P04 3x a week in this article (http://www.aquaticplantcentral.com/forumapc/fertilizing/15225-estimative-index-dosing-guide.html) and the Rotala Butterfly Calculator telling me to dose 1/64 tsp 3x a week.

I know it's "estimative" but that's kinda a jump. Should I be going by the calculator or what the articles like this one says? Over at his calculator (https://www.thenutrientcompany.com/aquarium/calculators/ei_calculator/) it's telling me to dose at 1/16tsp.

I'm just trying to find the right place to start and then be able to adjust from that. But... that's the tricky part, is to find the right place to start with all the conflicting information.

13 years ago I was doing PPMD. Getting back into it again and found that Tom has coming up with the EI so really wanting to start with that as a baseline and then go from there.

Thanks,

Chung