Just wanted to say thanks for all the input regarding fert's etc, I have decided what i am going to attempted and thought i would note it here at the start and see where we end up.
I am going to use Seachem products and Co2 dosing together with twice weekly water changes of 4000 ml approx. 25%
before starting the above regime i am going to dose Potassium and Iron, then leave for a couple of days before starting with day 1.
I will take daily TDS readings together with before and after readings on days 1 and 4.
The dosing is approx 50% of that recommended by Seachem and i will observe and slowly ramp up as and when required.
I will continue with water tests on days 1 and 4 and hopefully reduce to just weekly once i am confident.
The baseline TDS will be 165 with +/- 20