need some help with my lady.

Here is my girl i have her at 500 ppm currently dilluted down from 700ppm
idk whats wrong with her i could use some help. possible i think its over fert?
new growth is black


i have calmag in there with the FF nutes in distilled water. 5 gallon 1tsp Grow big Hydro 2tsp Grow BIG 1tsp Calmag plus (botanicare) per gal.
gave me about 700ppm
Then i added 3 gallons of water ph'd that was like 200ppm (tapwater)
That took it to where it is now at 500ppm

Now i just got back from the store with more distilled water and dont know what i should mix. the plants got decent size roots and they have been growing but the top growth is stunted. and btw this is an Aeroponic setup.

should i take it down to 300ppm ?? the plant has some roots, probobly about 60+ shoots its about 2 weeks old.
 

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