For instance, Rotala say to (mix 40.05 grams) of mgso4 in 250 mil water and dose 15ml to get 1.57ppm of mg per dose. That's 4.71 ppm per week.

Aquarium calculators says to (mix30 grams) of mgso4 in 250mil and dose 19mil to get 1.498ppm per dose and a total of 4.495ppm per week.

So which one is right??

Also, rotala doesn't give the mg from the trace. Aquarium calculators does.

Rotala says to (mix 4.95 grams) of kh2po4 in 250 mil and dose 15mil to get 1.37ppm per dose. 4.11per week

Aquarium calculators says to (mix 15 grams) of kh2po4 in 250mil and dose 15 mil to get 1.368 ppm per dose. 4.104per week.

This is a big difference in the amount to mix here.

Which is right??

Rotala doesn't have K2SO4 either. If I need to bump up the K

Next question:

What are my target levels per dose if I'm dosing 3 times a week

N, P, K, Mg, Fe