the grey-ish tips I guess or white-ish I didn't rinse the coco well enough, so that was my fault... I Thought I had soaked with 6.0, flushed with 6.0 and pre-charged at 5.98, but I must not of ran enough though, this was first time using this brand of coco.. So I think it's a bit higher then other's I used just from run off I checked.. No biggy, them well under control now... I just never remove leave until the growth doing fine and 100% stable, if ya take off before plant stable it will just move on to other leaves.. That I can safely remove, but I'm just waiting for more green to fill in first I not want to slow the growth down at all just to take off the ugly leaves, they'll be off soon enough.