when should I start usin frets on my auto??

are you talking about fertilizers? if you are using autos I would wait about 3-4 weeks into the grow then start at 1/4 strength
 
Are autos more sensitive to nutrients? I have just started one on 1/4 strength nutrients. My last non auto took full strength eventually like candy. I know all strains are different.
 
I have grown like 6 or 7 different autos and none of them were sensitive to nutes. I think folks are just giving it to them when they dont require them. And therefore causing issues. In soil of course. Hydro is a different story
 
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