My strawberry cough same like my previous strawber...

Thank you all for advice, For now, i did this, gave 1 L of water with a bit of Epsom salts dissolved (400 ppm) and now at the end of the week 4 days after last big watering watered with 6L of ph 6.2 and 600 ppm with nutrients till runoff and measured runoff it was 6.7 ph and 1000 ppm. Also today during the lights off I foliar sprayed Magnifical on the plant. Other Indica plant C-Vibez which was until now fed the same as this one with deficiency, was also given secondary watering of the week 6.2 ph 800 ppm and runoff was 6.8 and also 1000 ppm. I probably made a mistake switching to PK nutrients this week as they started stretching and were on 12-12 for a second week now but that was not a cause of the issue as this Strawberry had pale leaves like this from when she was a seedling and I had same issue with Strawberry Cough in my last grow. I was increasing magnifical every week but didn't notice any improvments or regress. It was just growing like that. I'll choose helpful answer in a few days when I see if this calmag boost will solve this issue.

O forgot: also best to water with runoff when using hydro nutrients, prevents buildup of salts in the soil that lock out other nutrients. If you soil is getting to compact and water logged you need to add in more perlite or w/e next grow to prevent that and aid in drainage,

according to the MDS on Remo, the MagNifiCal formula has 14-15% Magnesium Nitrate. and about 7% calcium. You could try upping the amount of that, or just supplementing more Magnesium via epsolm salts aka magnesium sulphide [MgSO₄]. The extra calcium won't hurt it but it will spike your EC a good amount. Also the remo grow has magnesium sulphate [MgSO₄] at around 12% according to their MDS, and according to your feeds listed on the diary your not using any?? However it's part of their feeding guide. https://www.remonutrients.com/content/uploads/RemoFeedChart.png Maybe try following the recommended feed guide and then diluting the solution down to your desired EC. and EC of 1.2-1.5 is not bad. Some plants can take 1.6-1.8 In Short, add in remo grow to the nutrient formulia solution and cut out bloom till its done stretching and follow the feeding guide then dilute down to your desired EC. Can give it a one time quick MG feed with some plane water and [MgSO₄] to help boost its levels backup before next feed. Can find MgSO₄ at dollar store or pharmacy, get unscented and USP grad if they have it. Good Luck!

Magnesium deficiency is what it is showing. Cal mag.

Too much PK: stop using Bloom fertilizer in veg.

Classic signs of a magnesium deficiency, those leaves are a dead giveaway. Normally the cause of a magnesium deficiency has to do with the pH being off but yours seems in range, just to be sure to calibrate your pH pen to cancel that out as an issue, You're also using a CalMag supplement so that can't be it either, which leads me to think it has something to do with how your watering routine, If the soil is too moist or if you overwater your plant, it may be flushing the medium of magnesium.