Planted Tank Enthusiast
Join Date: Oct 2002
Location: Minneapolis, MN
Laterite is VERY different from Flourite.
Laterite is a powder-like substance and is added to the tank BEFORE water is added, it is nearly impossible to add it to an already estalished tank, unless you mix it with very little water and put it (it will be like clay) under the gravel, but I don't know how this workes.
Flourite is a porous clay gravel that is a very good and easy way to go. Flourite doesn't cloud the water (if it is rinsed enough) and is easily added to an established tank. It is porous, so it absorbs nutrients from the water collumn.
Hope this helps, and good luck with your tanks!
Tank in transition! 55 gallons, hard water.