2 week old clone showing signs of deficiency? Should I use Ro water or rain water? And should I use calmag and superthrive? Thank you

check out the vast amount of help on you tube and find the cloise picture of your plant follow your path by asking questions on search. Some day you will have all the info right here but not just yet stay with Mr. Grow It always

We would need a lot more information.

What strain is it?

Is it in Veg or Flower stage?

If in Veg, for how long?

If in Flower stage, For how long?

Indoor or outdoor?

Soil, Soilless or Hydro?

If soil/soilless, what is in your mix?

If soil/soilless, what size pot?

Size of grow space (LxWxH)?

Make and model of grow light?

Temperature in the environment?

Humidity in the environment?

PH of medium or reservoir?

PPM of medium or reservoir?

Any Pests?

How often are you watering?

Type and strength of nutrients used?