help needed,solution for cannabis deficiency?

hi, these are a few clones i took off my first grow. Im unsure what type of deficiency this is and how to solve it? There a couple of weeks old, grown in soil. Thanks

it could be nute burn... what are you feeding it?

Im only currently feeding them water, I have nutes but I thought they would be to young to take nutes at minute? There about 2 and half weeks old under a 2 foot 4 tube t5. Maybe my ph is doing this? I dont have a ph meter at minute but there is one in the post so I can check that soon. Do you think its time to start feeding them nutes now? Like I say these are the clones off my first grow so im just learning along the way

u said u just water them? no nutes so how often u drink them
mraliens

I water them every couple of days, as soon as the soil has dried out