The thing I've noticed is time, calcium, and good lighting is important. Lighting seems very important to me now for this reason: My 60 gal. had decent growth but once my bulbs got old and I slacked on calcium (was actually using purple up), purple slowly faded. However, my 150 gal. with LED's and the calcium I'm using now is doing great, but the old power compacts with the same calcium in my 60 gal. and during same time frame has hardly any coraline growth. Translation - with the same calcium and water treatment in the same time frame, without good lighting, coraline would not grow adequately for me.....results may vary.