i have 3x 700g florapol for sale . 40$ ea. u can search google for more info. its much better compare to ada and other addictives and easy to use... u can use it under any kind of substrate even sand. i use it under my very old fluval stratum( no nutrition at all). 1 bag 700g can cover 80-120 cm bottom.and will last for more than 3 years.