Okay.
Your pH is too low.
You're using a completely wrong fertilizer for young cannabis, ESPECIALLY in hydroponics.
You have no way to check temperature.
You don't know your ppm- even worse because your fert is wrong to begin with.

You will either need to basically re-do your setup from scratch, following the basic DWC guidelines outlined in several grow logs (check the 'styles' thread stickied in basic), or consider switching to soil, which is more forgiving if you don't have the correct equipment.