Dark green edges pics

i have these 5 mako haze clones in my flood/drain hydro setup using the cutting edge solutions line besides the mag amp. They are only about 2 and 1/2 weeks old and have been just taking off with the tallest being atleast 16 inches. The one problem i have noticed is that on mostly the new growth im seeing darker green edges(i hope you can tell what im talking about in the pics). I started them off at 1/2 strength(about 600ppm) nutes and saw some burn so i bumped it down to about 3/8 strength(about 450ppm) last week. Thanks for any input you can give.

that happened to my planst for a while but nuttin bad happen it was all good

i was just reading through all the millions of things that are in all the 5 bottles of nutes and i did not see copper listed. Does this look like it is my little problem?

u can feed ur plants some copper but not to much how much copper did ur bottle include

mine look the same way