Yes, a good thing. Mycelium helps to increase nutrients available to plants, improve water efficiency, reduce erosion by acting as a cellular net, and promote root growth by adding oxygen to the soil and releasing nitrogen, phosphate, and other micronutrients.
Plants have something the fungi needs: energy from the sun in the form of sugar. The fungi on the other hand, has something the plant needs: access to the nutrients trapped in complex organic molecules.
Ok, thanks you all, appreciate the input
Thank you @Caligurl for the detailed explanation of what is going on in there 
@Caligurl @Low @OGIncognito @Myfriendis410 @dbrn32 @Dinky
Any advice on this?
Using 100% coco
Autopots res is 1007 ppm and ph is 5.8
Jacks 321 only
Also ac infinity lighting at 30% about 24" above cannopy
Just topped and trimmed following nebula haze manifold
Hmmm i dont have any advice for it but it doesnt look like a deficiency to me looks like something foreign caused it
Dont see any evidence of bugs or critters in coco or on leaves, could it be light burn? I did have some lensing spots on there, but this just started in last 24 hours.
Not seeing anything overly concerning Growmie, leaves get bumps, scrapes and bruises along the way. Monitor to make sure it doesn’t progress but rare for a plant at this age to show signs of a deficiency. Your res numbers look good 
Thanks man, appreciate the response
