hey dude i wouldnt trip unless the whole plant is doin it leaves will tend to change colors but what you want to pay attention to is the top of the plant what you can do since ur using miracle grow is to water with a dish washing liquid which will clean the tips of the roots in case of salt build up i did and never had a problem check my plants out have a good day and remember dont try everything that everyone suggests because what i can see on hear is theres alot of amatuer growers here that dont know what theyre talkin about when it comes to growin advice later