problems rdwc

new to site i'm running rdwc
18 plants per run x 3
300 ltr res x 3
3 plants per 1000 hps
water temps 70 water chiller x3
humidity 45 55
temps 77 80
30 gallon buckets 12 in air stone in each hydroton with 4 in rockwel cube
i run h g aqua flakes, rooot excell ,mjulti zen,amino treatment r o water with magic cal 150 ppm have algen extract not using rep said to not use it with bubblers ???
13 16 in fans around room
my problem was i noticed ppm rising ph going down so i rinced with pure water and hydrosparkle i also ran out of multi zen so i used grozym.
ph started to rise again so made fresh batch base a b 700 with aditives total 940 ppm i let my ph drift from 5.5 -6.5 usually roots were pretty white next day went in roots turned dark brown root rot ??? ph is falling ppm rising
plant look somewhat healthy
i will post some pics
havnt done much trimming since had problems wanted to wait until got things figured out
not too sure if i should be lowering ppm for rdwc.
not sure if grozyme and amino treatment are not compatible
could use some good adevice from rdwc growers thanxs in advance some
See pics below






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