Slow/stunted growth. First dwc

AN nutes arrived today. Going to swap over each barrel to RO water and switch nutes.
Hows best to do this?...
In regard to how much nutes to give?..
Half strength full strength or try and match ppm to what it is now..
Will be adding rhino then calmag..
Im considering switching the lights back to 12/12 also
 
Bought those mini submersibles tt..
Not in use yet as leads are too short!.. dont like having sockets in the tent :-/
 
Changed the water over to RO last night.
And started using AN
Ph is 5.4
And ppm is 900
One plant is lagging behind and I think the roots are going bad. All other plants have nice healthy white looking roots..
But the one plant has darken roots. They haven't turned to mush or slimy.. so I'm not sure.
Some leaves have what looks to me like burning.. again im unsure.. and the pics don't really show it well..
 

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Whats causing the rust spots??
img044-jpg.27894
 
I think it had started just before tbh.. but just not to the extent they are now and only on the one plant.. now its all of them
The one with root damage? if so that's your answer and I would not add anything yet. What are your water temps and have they changed? Are you running sterile or any kind of beneficial bacteria?

Open each rez and smell. Do they smell different? Or like mildew
 
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The weathers been cooler recently so res temps have stayed around 17/18 c
And they havent changed.
Im running sensizym now at half strength which i wasnt before..
Couldnt smell anything different as im full of cold atm
Ppm was at 860 when i last checked
 
Temps should be 20-21 C. Your water temps are a bit to low. Use the sensizym at full strength, I have never used sensizym before but it won't hurt. Can you take pics of the roots closeup.
 
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