Can anybody diagnose this - Picture's inside

I have a Indoor Grow, with 2x 400 Watts Blue Spec Lamps, am just under 3 weeks into veg, using Coco with Cork and Mills Nutes(1ml Nutes per litre of water), ensureing PH is 5.9, watering every 3 days.

In my pics, their are spots emerging on some of the leafs, also more towards the end of the leafs.

What could this be?

if those nute's are made for coco bump it up.lacking alittle cal-mag

Calmag and more food

New veg looks good on all of em. I'd agree with bumping up feed strength. Calmag too if you use RO water to feed.

Thanks for the reply Guys,
When you say CalMag, Is that short for Calcium and Magnesium?

I will Ramp up the Nute amounts next water.
Also, Should I be watering every 2 days, 3 days? 4 Days? What do you advise?

Also, I have made another thread where I post a pic of all my plants, do you think they are behind for 20 days?

https://www.rollitup.org/t/20-days-in-do-my-plants-look-terrible-bad-ok-good-hd-pic-inside.901951/

Its just short for calcium & magnesium as you said.
Do as you have been doing with the watering. She'll let you know when you are doing it too much or too little.

Thanks HydroRed, I will add epsom salts, as for the calcium il google to see what u guys are using

No problem. If you arent picky, they are all pretty much the same. I use General Hydroponics CALi-MAGic. I think it was like $12 for a qt. & a little goes a long way.

don't let that coco get to dry,it burns roots if to dry

do you have holes in the bottom of those cups? Pick up cup, when it feels light, time to water, don't let it get completely dry, keep it moist but not saturated.

thumper60 said:

don't let that coco get to dry,it burns roots if to dry

Click to expand...

ok

chuck estevez said:

do you have holes in the bottom of those cups? Pick up cup, when it feels light, time to water, don't let it get completely dry, keep it moist but not saturated.

Click to expand...

Yes there are holes.

What do you guys think about watering every day vs every 3 days?

It should be as needed vs a timed schedule thing. If they aint drinking you just end up overwatering or if they drink faster than normal they could go dry.

so on the calimaGic? 5 or 6 ml per gal?

If you are using R/O water you can use like 5ml per gal. If using tap water, just 1-2 ml per gal will work. I dont use coco but heard it needs to be treated like hydro with waterings more frequent. If it doesnt get watered enough it will end up over fertilizing. When you water, just make sure there is runoff. If there isnt run off in coco then you arent watering enough. I dont believe overwatering is a concern with coco though.

Before you start adding unnecessarily nutrients to the mix, are you only noticing this on leaves where there has been overlap with another leaf on top? What is your current environment (temperature, RH, grow space info, etc.)? Have you done a slurry test to determine the runoff pH?

In general, when troubleshooting an issue, you should consider environment first, then check pH to make sure you're in the sweet spot (5.6-6.2 is common wisdom, allowing for some flux up an down the chart is fine as well, it doesn't need to be dead on at a particular pH if you stay in range), and finally use additional nutrients to correct as necessary, not as the first response.