Yo need some help over here XD

i have 8 hempstar ladys veging atm they are about 3 weeks old and under a 400w hps they where under a 125 w clf light for first 2 weeks. the plants have have started there first growth spurt about a week ago so started to feeded at half strength with CANNA coco A. not long after i noticed that i was getting some leaf damage im not shure if it is an enviroment problem ora nut prob. im growing at a friend house as i cant have grow at home atm so was a bit shocked when i went round after not checking for a few days. i have checked the p.h. level of the run off and it is 6.5-7 (have idioden test(poor atm)). so that seems fine the average temp is 28c which is a bit high but not bad,im useind diamand milar with a good extractor fan and an alright intake. they soil im useing is some high quility poting compost (60%) sand (5-10%) perlite (20%) andsome clay balls at the bottom of the pots to help drainage(10%).

anyway the probs with the leaves are concerning me a bit to much for comfort there are a few leaves look deformed which im thinking might be leaf burn in first pics and what i think might be calcum probs on other leaves is the second batch. This only my 6th grow and it been well over a year since i did it last, so a bit rusty. I want to switch to 12/12 in a1 weeks time so would be grate to get this prob sorted befor then. any help?? plz

more photo`s

I cant quite tell how many sets of leaves you have but if its under five, flush'em now as you shouldn't be ferting until you've got atleast 5 leaf nodes. I say this because it looks like nute burn to me.

Disclaimer, im a total noob when it comes to growing, so take everything i say as just a noobs opinion.

edit: looks like you posted some more photos whilst i was typing, so my theory on it being too early to fert is out. Still kinda looks like nute burn to me.

Canna Coco nutes are a Part A, Part B type of nutrient. You are supposed to use both parts together. Right now you are feeding them 4-0-1. Part B is 1-4-2. (I took those values off bottles of Canna Coco Parts A & B) Someone who is more familiar than me with how those values work can probably recommend a good dilution rate for you.

...but ya gotta get the Part B.

PC :smokin:

i do have canna b and have been useing it forgot to put that in haha i have flushed them today and hope to c an improvement over the next couple of days. ill let u know if there is any change.thnx for help.