I need some help please

I have 2 plants that i take care of exactly the same, water and nutrients are given at the same time and dosage. One plant is doing well but the other one now has new foliage growing bright green with brown marks all over it. I dont know how to fix this. Please help me i dont want to lose her!

its hard to say with no pics bro but sounds to me like you may have given them a little too much nutes? if this is the case then what you should do is mix a few drops of dishwashing liquid into some clean water its good to let water sit over night to let chlorine etc evaporate off and water your plants with it it helps get rid of any built up salts and toxins give them a good drenching with it making sure water starts coming out into drip tray this will giv them a gd clean out and after a few days plain water start your fert regime up again but jst lower the dose, hope this helps

thanks bro i really appreciate the advice. I would put a pic up but im a noob at this and dont know how to load one up. Dishwashing liquid? like soap?