Brown or yellow spots - I can't tell

[BigTrees]

Hello there im about 3/4 weeks into my first ever grow and im using coco, and on some of the plants i can see an odd spot or two either brown or yellow i cant tell propperly, sometimes the edge of a leaf or two are slightly brown ish, the girls seem to still be growing quickly, how do they look? They are white widow.

Could you please let me know what you think the problem is?

Any help would be greatly appreciated.

If i havent taken good enough photos let me know and i will get some more later.

 

[Autoflower420]

Re: Brown or yellow spots i cant tell

Are u using cal mag coco need cal mag

 

[BigTrees]

Re: Brown or yellow spots i cant tell

Growing in coco and my nutes atm are Canna CoCo part A & Part B , Rhizotonic, and canazym. So they need Cal Mag?

 

[Autoflower420]

Re: Brown or yellow spots i cant tell

Growing in coco and my nutes atm are Canna CoCo part A & Part B , Rhizotonic, and canazym. So they need Cal Mag?

Yes coco and led need cal mag dude

 

[Calvados]

Neut burn is pretty distinctive. That looks yellow.

 

[GrizzWald]

Coco and leds doesn't mean add cal mag, especially when using coco nutrients.. .. looks like water droplets onto leaf, to me.. you'll know if you need to add cal mag and they don't need it at the moment.. guess would be your using tap water? Tear could happen by picking up pot with the leaf or it poked or bent.... looking good mate..