should I add nutes?

I just did a water change, I only notice a few of the hairs to be turning the brown color, should I add nutes or am I close to when you should leave plain H2O for the taste factor when puffin.

P.S. how much longer appx. till harvest would anyone have idea.:thumbsup:

nutes are good.

kinda hard to tell by hair color.

some say when 80-90% are brown, but getting a microscope from radioshack would be better. You can tell when the triches start to become amber colored.