I'm not sure I agree with that - as it grows extremely well for me. Perhaps I'm lucky? It is easier than the Toninas, however. Against my normal ways, I added some calcium/magnesium/iron to the tank, and my Toninas are turning brown - but the Eriocaulons are still doing fine. I'm going back to no ferts! (have naturally very soft water). Anyway, in my humble opinion, Eriocaulon Setaceum is much easier than Tonina Sp. Belem or Tonina Fluviatilis.