Leaves Turning Yellow And Droopy - Pics Attached - Please Help!

HighTimesUK

Active Member
HI
I am new to growing and all was going well for the first 7 weeks but then the tips of the leaves started going yellow and after most of the leaves went yellow they drooped and went crusty and brown at the edges so i pulled them all off but now all the new leaves are doing the same! Am panicking because only 1 of the 5 plants did it but now the others are going the same way - HELP PLEASE!!! x :-? PICTURES ATTACHED!
They are being grown inside on 24 hour light cycle for 7 weeks, feeding every 1 - 2 days with nitrogen rich tomato plant food.

 
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