Coco hempy some help needed

Hi to all members im new to rollitup and new to coco hempy. I need some help. I have 4 plants in 2 gallon coco hempy. 3 of them doing good but I have problem with one of them. Plant put yellow tips at new growth at the tops. Problem start when plant is small seedling and continue to today plant is tree now with more than 20 big tops. I read all over the net and post in different forums but nobody can give advice what is f... problem. I use canna coco nutes currently at 930 ppm. Ph 5.8. My tap is 150 ppm. I also try cal mag at different doses from low to full dose nothing help. Also use liquid silicon.
I try to play with basic nutes and problem hit hard when I lower nutes. Problem hit also when I supercrop. Run off is ph and ppm is close to what I feed. Also new growth is slight green. I dont know what other to say so if somebody have questions I will answer. Environment is good 600 mh air cooled .... temp and rh is good. I really want to know what is this issues because I have same problem with one strain my previous grow in peat most compost and nothing helped. Thanks for answers and please only don't tell me I overfeed because I will shoot my self.

And want to post some pics with light off because I think new growth is little pale compare to establish leaves which turn very dark but this happening after massive supercrop and removing all leaves and I think its just from stress from supercrop

Maimunji said:

And want to post some pics with light off because I think new growth is little pale compare to establish leaves which turn very dark but this happening after massive supercrop and removing all leaves and I think its just from stress from supercrop

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WELCOME TO R.I.U

coco needs full strength cal/mag + 1/4 strength cal/mag foliage spray every 3 days

VG

Thanks for answering vertical g. Im afraid to hit full dose cal mag which is 4 0 0 Npk because I use almoust full streight canna coco nutes from heavy feeding chart and my ppm goes crazy with full dose. But I hit from time to time full streight cal mag also foliar with epsom. I will try foliar with cal mag. I use more than half strength every water cal mag. Full dose is 2 ml/l so for 5 litres I use around 8 ml cal mag. If someone want to say me im cronic over feeder I just want to say problem with yellow tips is long time ago when I feed at around 0.8 to 1.0 ec. Actually there is a moment when plants stop to put them and this is when I start to feed full dose cal mag and basic nutes at around 1.8 ec. But this is not for longer after supercrop plants start to yellow tips again.