Hello all I am working on building a sump for my 1200L, I have a 200L tank running 2 filter socks and am going to try k1 moving media if I can find some. I am going to run an auto water change drip system with overflow to drain which I was wanting to use this http://www.trademe.co.nz/pets-animals/f ... 340152.htm to clean the water coming in. Has anyone used them? do I need to add anything to the water to keep fish Health? I have read using ro can make ph unstable is this correct?
Thanks chris