Copper deficiency or what is it?

I think this is copper deficiency or what else? I don't know for sure what is it but I think is from pH I use tap water with nutrients and I don't have a pH measure. Can you please tell me what is it?

Copper deficiency or what?

quick put some pennies in some water and water your plant with it!! no im just kidding. actually you should be looking for issues in new growth. those two leaves at the bottom are the two original leaf's your plant starts with and they are just used up. yellowing and dieing is normal.