I suppose "grows like crazy" is slightly relative- nothing in that particular tank grows quickly other than the floating plants, as I specifically chose low-tech slow growers. But after a year there is just...lots. I started to say "at least quadruple" but then I remembered that I have removed at least quadruple the amount that I originally bought over the course of the year.
But...as you asked...I use remineralised RO, which I was originally remineralising to 200ppm for the cherry shrimp, but over the year I've slowly brought it down to about 75ppm for the fish. Fluval 3.0 lights, temp of 26C, the tank is low-flow with a HMF, and I fertilise it...occasionally...with EasyLife Profito. Not exactly up to the standards of many here.
I was told when I bought the plant that it needed good flow to survive, but it's doing best in the "deadest" part of the tank, for some reason. The only problem is that I occasionally have to remove fronds because they're covered in algae.