The Edges are Browning

Weed Anubis

Well-Known Member
the edges of my plant are browning, im using a hydro drip system under 400w MH lights and i just got the plants i bought them from a shop they were clones in a Rock wool cube 3x3. and roots were coming out the bottom a little, i have had them only one week and i gave them a half solution of nutes. i'm going to change the water tomorrow so i would like to know what i should do about the browning?
 
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