Copper color

Some of my leaves have change to a copper color, and started to curl a little.Which means they are over fertilized a little.So i flushed w/ water forcing water to drain out from the pot.My question is how long until i see them start to recover?Should i cut the bad leaves off now?My plants are about 4 weeks into flowering.Also i have stopped nutrients at this point.Can some one let me know if this is alright?

if leaves are dead cut em off and if just yellow u can cut in half shld come back in a few days gl