Sounds like over fed. Pics would help alot. May be a ph issue.
Why don't people give more information when describing a problem. Things like feed strength, soil or hydro, light, in veg or flower...and at what stage,
Not tryin to knock on ya man...it's just alot easier to solve a problem if we have some information to go by...especially without pics.
Rule of thumb: Leaves curling up...plant is looking for something. Leaves curling down....plant has too much of something.
Drink!