Coco nutrients from day one

Hi guys, I'm rookie and about to start my first grow California snow Auto by fast buds seed is almost germinated and ready to go to it's first and final 3 gallon smart pot the medium I'm using is 50:50 ratio Coco coir and perlite. Coco came as a brick but has been washed and double buffered. I'm planning to treat as hydro but I will be hand watering twice a day to start with and I'll be looking for 20-40% run off.
nutrients I'm planning on using is
Calimag
Maxicrop root growth stimulant
Canna Coco a+b
I'm planning to micro dose nutrients up to 400 ppm 5.8ph from day one bearing in mind my tap water in it self has 300 ppm I'm not left with any wiggle room to play. My question is shall I stick with my plan. Or will that kill little seedling and I'm better off tap water for week one ? The reason I want to feed my seedlings is because Coco itself has no nutrients to jump start the growth

I start my seedlings in coco around 350 or so ppm. That’s with tap water at 150 ppm. So about 150-200 ppm nutes. Slowly go up on ppm. Usually takes me 5-6 weeks to get to 850-1000 ppm.

420drummer said:

I start my seedlings in coco around 350 or so ppm. That’s with tap water at 150 ppm. So about 150-200 ppm nutes. Slowly go up on ppm. Usually takes me 5-6 weeks to get to 850-1000 ppm.

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Thanks, do you add calmag every watering ?

The jacks I use has bag of cal nitrate and I use Epsom salt for the magnesium.

But if what your using doesn’t have cal mag already in it you definitely need it in coco especially