plants declining

[Sean Fox]

Hello Everyone,

I'm new to this forum and plan to make an entry in the Intro section soon enough .But , until then I was hoping someone could give me some incite into my plants decling  health .

Quick run down: 

two 1000 l  IBC FT  six  300l GB  two 500l ST

 New system ,2 months old. plants went in from transfer from soil garden before first frost (Sept 15)

Mainly Swiss Chard ,Kale  relatively happy and health during cycling some yellowing  Adjusted ph down dose with sea weed juice. Seemed to be holding their own.

Added trout 1 1/2 weeks ago and plants seem to be failing quickly. Symptom: new growth stems seem to be withering. Decent amount of new growth coming but slowly dying off . A few aphids but no infestation.

Is this just a new system trying to find its way or is there something happening that I'm not seeing.

Thanks for the help

Sean