Help Needed!!!!

Hi all

Im running 6 bubblers 25ltr buckets with 2 600w lights now in 4th wk of 12/12 and all my babies seem to have a lot of yellow leaves some pure yellow.

2 of them also have little brown what look like burn spots on the yellow leaves.

on one of the other plants the top bud has what looks like browning of the centre part of the leaf and looks to be twisting??

I vegged with canna hydro veg then switched to canna hydro flor 10ml per 10ltr wich i then got told was the wrong nute for bubblers and have now changed it it Aqua flora at 20ml per 10ltr all are A/B's

with this im using Boost at 10ml, hydrozime 5ml

I nute my buckets then test PH (its always around late 7) so bring it down to 5.7-6

Temp is between 19c evening and 20-26c daytime @ between 48-60% humidity mostly around 50-56%

My water seems very hard could the calcium be affecting the plants?

Really want to find out how to get them back to a pure green

Any ideas would be great..I have looked at the problem page on here and with the yellowing im guessing it could be a lack of Mag, pot,zinc or nitro...What products can i get to help?

Cheers

Chedds..

Need some pics.

It sounds like normal flowering but with out pics I am just guessing.

I would definitely get that ph in order. And get us some pics so we can help you. Take pics of the whole plant and the problem areas. Show us the worst and best plants.

Thanks

The 2 top shots and the leaf with the browning in the middle are the same plant

the other you can see has a lot of yellow leaves and thats more or less how they all look..???

This was off the same plant as the pic of the leaf close up and from above..

Sorry the 4 pics above the first 2 are the same plant the other 2 pics are different plants.

Looks like possible heat stress or light burn. can't tell casue the HPS pics all messed up. Something is wrong.