Led, Coco, RO. Cal Mg dose?

I have two plants in veg in coco under a 300w advanced DS led, being fed maxibloom @ 1/2 tsp and CALiMAGic @ 1 tsp per gallon every watering. One of the plants has a calcium deficiency and the other one is fine. Both are the same strain but from seed. I understand that you need to use more cal-mg for led, coco, and RO water. How much cal-mg would you recommend for my situation? Also is it possible to over use cal-mg? ie 2 or 3 tsp/gal.

100-150 ppm cal-mag with ro should be fine for coco as long as your not doing anything crazy with the ph. with tap water you might not need it. and yes its possible to over do it with cal-mag same as any other fert.

Agreed, 100-120ppm is what I've been told many times.

i do @100ppm they first few weeks in coco then (when i use ro) just base nutes unless it looks like it needs it. when i use my local tapwater i skip the cal-mag (its pretty hard water tho) hth

1itsme said:

100-150 ppm cal-mag with ro should be fine for coco as long as your not doing anything crazy with the ph. with tap water you might not need it. and yes its possible to over do it with cal-mag same as any other fert.

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Ph is always put to 5.8 so im good there. No ppm tester at the moment so not sure what 1 tsp of CALiMAGic comes to. Wish I could use tap but im on some pretty bad well water that runs through a softner. Read some where that you shouldn't use softened water due to the salt.

djwimbo said:

Agreed, 100-120ppm is what I've been told many times.

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1itsme said:

i do @100ppm they first few weeks in coco then (when i use ro) just base nutes unless it looks like it needs it. when i use my local tapwater i skip the cal-mag (its pretty hard water tho) hth

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Looks like I need to get a ppm pen to make sure im giving them this amount. thanks for the help

1itsme said:

i do @100ppm they first few weeks in coco then (when i use ro) just base nutes unless it looks like it needs it. when i use my local tapwater i skip the cal-mag (its pretty hard water tho) hth

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it is posible to overdose if u use tap water and apply the cal - mag ?

litz said:

it is posible to overdose if u use tap water and apply the cal - mag ?

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Yes, measure PPM, and adjust based on that.

My tap is 160ppm, gravity filtered and dechlorinated, is 108-120ppm.

I add CaMg until my PPM is ~225(110-120 base), pH balance, then add the rest of the nutes.

djwimbo said:

Yes, measure PPM, and adjust based on that.

My tap is 160ppm, gravity filtered and dechlorinated, is 108-120ppm.

I add CaMg until my PPM is ~225(110-120 base), pH balance, then add the rest of the nutes.

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GOT IT ! .... Thanks for the info !!!

Go with Advanced Nutrients...I have never seen any issue with that...im using 1 year, maybe more...and no need any ph +/- solutions just mix it tap or ro water and use it..Easy....