Only problems, nothing seems to work this time for me..

Hi , I am growing in coco/perlite mix, most of the plants have stunted and ain't growing at all...I have flushed ,I have sprayed ,changed lightning...nothing is working...
I have checked the runoff and ph and ec is adjusted as it should be...they are showing classic serious signs of cal/mag deficiency problems...I am using Canna Coco , so it should have the extra cal mag in it preventing this from happening....I did one feeding included WAY TOO HIGH amount with Grow Tech Silica product in the feeding water and had to add serious amount of ph- to get the feeding water in check...also the EC was too high , I thought it wouldn't matter because the extra 0.4 is from the silica...well I ques it did...anyway it should be all flushed out from the roots now...but the plants just ain't growing barely at all....I don't know what can be done...sprayed them with many different products...today latest with calmag...my water is well water 0.6 hard water , it have been working just fine with the previous grows...this time it Critical 2.0 from Dinafem.

And the plants are 6 weeks 2 days old...!!!

I would confirm the Cana Coco has enough Mg and Ca in it for starters. If you feel you're short on Mg, add some Epsom Salt (it does appear that you're short on Mg, based on your pictures). How much are you feeding, how often are you feeding, are you feeding every time you water? Are you premixing your nutrient and if so is it staying in your desired pH range through out its use? Start here and let's see what you come up with.

I read that you should feed every day in coco,I used to feel when pots getting lighter and feed them the before, and that has always worked until they are ready for drip system with timer...now I probably also put them too soon for regular feed..the small ones I took away from HPS environment and back under T-5'S and hand watering because they did ok before I tried to water them everyday (feeding)...in coco with perlite I newer use just water thats is not the way to do in hydro..
I will now do every day calmag spraying and to see if it helps, the bigger ones (not in pic) I will put in bigger pots...to see if from some reason the roots are infected from the overdose of silica...

And thanks for commenting it is good to have these brainstorming things they will help my self to come up with ideas, I probably know but have forgotten..so to revitalize my understanding..