How long does Flourite last
Actually, there is more to flourite than iron as you are stating. Take a look at this link: http://www.seachem.com/Products/product_pages/Flourite.html There are also alternate sites confirming there is more than iron as well. This is straight from the website:Flourite only has trace Fe so it's good for along time before it turns to mush. I've used it for three years at a time without problems but I dose water column ferts so I don't depend on the substrate to do anything but give a good CEC count. The same is true for Eco in my opinion there both about the same in my book.
power compactsyea that amount of light is plenty. That is 4.3 watts a gallon, a bit on the high side. What kind of lights are they? You may not need all of that.
really? so 2 watts per gallon is enough2x65watt is all you will need in a 60gal. They are shallow tanks and light will not have any trouble maintaining more than adequate levels at the substrate.