Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Posts: 5,576
Root tab's with sand can work well, and many folk's use it with good result's.
I might make or purchase root tab's that contained product such as Osmocote, for many of the commercial root tab's are mostly Iron, and these alone may not provide enough in the way of macro nutrient's for good/better growth IME