Autoflower very low ppm flowering

Hi Guys,

I dialed back my ppms from like 900+ all the way down to like 400ppm
my auto is like week 3 or so into flower and it seems the same whether i threw in high ppm or low

so does this mean i was overdoing it?
can i safely run very low ppm?
what do i need to look out for?

how will i know when its too little?

If your ph is good and doesn't fluctuate to much,then lack of the nessersary will be easily spotted.

What strain? I like to feed my auto's around 600. They really tend to be light feeders. Only had a couple that seemed to like the 8's.

If you are feeding too little then the plant will show a limp,pale greeny Yellow coloured leafs through out the plant.
When it comes to over doing it the ppm is usually high around week 3-6, then lowered after this.
Your ppm could be slightly too high at this point but if you are getting no difficiencies with 900ppm then continue feeding at that rate. She can eat!!