Rotala butterfly K dosing confusion
I'm trying to figure out how much to dose with Ei in my 30 gallon, high tech and heavy planted tank.
I have the following salts from AquariumPlantfoodUK:
Chelated Trace mix
I actually have 2 questions that confuses me:
If i click on "Estimative index" in the "i am calculating for" when dosing MgSO4.7H2O, it says to dose 5ppm (5,68 gram), 2-4 times a week. I dose 3 times a week, so that would be 15ppm a week. But how i understand Ei ppm targets, it should be something like 5-10ppm Mg?
Obviously i could just type in "Dose to reach a target" of maybe 3ppm per dosing, and reach 9ppm Mg every week. It just confuses me the two are so far apart in ppm targets. I have always followed Rotala Butterflies' requested 5ppm per dose/15 ppm a week, but it looks like that would be too much?
Now that i look closer into how much ppm of what i put in my tank, i can see on Rotala butterfly, that dosing KH2PO4 1.3ppm 3x a week (3.9ppm weekly), and KNO3 7.5ppm 3x a week (22,5ppm weekly), will only give me 15.8ppm of K weekly. And the typical Ei is 20-30ppm?
Do i need to buy more K in the form of something like K2SO4?
Hope you guys can help, i've been struggling with this as i'm not very good with numbers.