Help needed nitrogen or mag def???

Hi all, really need some help here with my babies. not sure whats happening and could do with some expert advice! i have 3 lsd and 1 critical plus and there not looking too healthy.
There in veg at 2months due to needing to relocate them and have been lst'd. now in there perm home theyve been repotted to 10l pots but not happy putting into flower till healthy.
i have them in a 1m2 tent with a 600w hps, 6" rvk outtake, 5"inline intake and a heater with digital thermostat.i used to have a humidifier in there but it stopped working so need to replace.
im using canna products to feed; canna a+b rhizo and cannazyme (first time using)
any help at all would be much appreciated on how to make my ladies healthy again!!

also my ph at every water/feed is between 5.8 and 6.2

The yellowing looks like N deficiency but could be from under watering.

Hey bud what you are experiencing is a nitrogen deficiency and possible cal-mag issue.. What you wanna do is increase your base nutrients to about 3/4 or full strength I find with using Canna products that although they are absolutely phenomenal products they run very weak.. If you are going full strength on those bases and still getting a nitrogen deficiency causing that yellowing feel free to go and get a simple nitrogen supplement and add to your bases.. You can use that starting off in small increments until the yellowing dissipates usually takes 3-5 days.. Also adding or upping the ml/gal of cal-mag I recommend Gen Hydro organic cal-mag blue bottle depending on your strain at 6-7 ml/gal.. This also has a small amount of nitrogen in it to keep everything nice and green.. In the mean time I would get a spray bottle and foliar feed at 8 ml/litre with the cal-mag and a vitamin b supplement like b-52 from advanced nutrients or a thrive alive green.. This should solve your problems in matter of a few days. Cheers