Please help my plants r dying

ok well last night before i went to sleep i checked on my plants and they were perfectly fine and then when i wake up this morning i see these yellowish spots on 2 different plants..the spot are on the top of the leaves and i honestly dont have a clue as to what it can be..please help i am a newbie and i really enjoy growing but things like this make the grow stressful..please help and i gratefull thank you in advance.





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What have you fed them? and how close are the lights?

regards,

It looks like you under feeding. i don't see nute burns on the tips. and its blotchy as if it were a deficiency. I don't think it's the light. If it were it would bleach the leaves before it would burn them.

ive been feeding them something called like jack's i think..im not too sure but its a blue powder and ive also been adding superthrive into the mix..i keep the 400 hps about 18 inches away from the tops and i use just regular potting soil

its just regular potting soil and i added extra perlite into it

would you be able to tell me which kind of deficiency it is? ive looked everywhere i just cant seem to find out what it is

funny thing that everyone i see use jacks seems to have deficiency problems. looks like it could be magnesium. it does look burnt too, i just noticed the leaves edges look flared up and that happens when its to hot and the plant is trying to cool itself down. first try and make it cooler in there and maybe raise the light a little. if that doesn't work then add a little more nutes


get some organic nutes, like botanicare, or hunmboldt nutes, or bio canna, etc.. add some molasses and compost tea and your plants will be awesome.

Are you sure you didn't spill something on the leaves? Maybe ferts or another chemical? Looks similar to mine when I spilled ferts directly on the leaves accidentily.