harvest time?

I have a 4'x4'x8' space with a 400w hid light, there are 2 plants that are growing in a DWC with 4 heavily aired stones, powered by an air pump obv..the plants were about 5-6" tall June 15th, I switched them into bloom on August 24th. I am trying to figure out when to harvest. I went out and bought a 60x-100x magnifier and when I used it, the trichomes, which I believe is the globs of resin? were mainly clear but appeared to be slightly milky. Can i get some insight please? Also, i am using a 60x-100x magnifier, im thinking of taking it back for a 30x just so it will be easier to see, considering the shakiness of such a small area, any advice?
 

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