...You do not need, nor should do water changes if you do the method I suggested there, read it, Diana's suggestion is the same as well, no water changes. Nothing builds up much because plants remove it, the rates of growth are very slow, so the demand for ferts is also correspondingly low....
Thanks for the advice
I think I'll do as you suggest for the low maintenance tank (probably not the Discus as this point). In fact, I had already picked up a small bottle of Equilibrium. Would there be any advantage to combining root tabs with water column dosing?