please tell me what this is and how to fix it!

im thinking it gets a lil too cold wen the lights are off im gonna throw in a screen and four cfls hopfully tomorro and the water was distilled water i bought from the store so it shouldn't be that but i got a ph tester coming in soon so hopefully it will help with diagnosis...thanks for all the help!

Maybe potassium deficient.....

dirty details of grow, plz....................

You can grow in soil so easy with canna bio products I got canna soil and bio veg/flower nutes and they have buffers in nutes so I never have to check ph just 40ml per 10L pour in when soil is dry 2 inch down that's it bish bash bosh. Only thing I did do wrong was use none bio boost with bio Flores and plant didn't like that much do as long as you stick to bio canna nutes life is easy. Guy at hydro shop was the one who told me its very popular been using for a year now and I see why it's popular, all the best

sorry bout the details...

it's in a 3gallon pot still vegging. didn't use any fertilizer and last time i watered it was distilled.plant was looking great yesterday and all of a sudden this happened so not sure whats wrong...

distilled water has no mg in it. try some epsom salts. mg def can spread fast. give it a go, imo.

i got a ph tester coming in soon

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When it arrives you can start growing properly. Hydro- 5.8 in the res , soil-6.5 all waterings and feeds at 6.5.

thanks guys! i got my dyna gro in last week and the plant made a recovery! i think it was a deficiency...