Planted Tank Enthusiast
Join Date: Feb 2009
Location: Alvarado, Texas
I used two in my 29 to get a nice slope with 3-4" in the back and 1-2" in the front. For a 55, you're probably fine using four bags.
"Success is not the goal, it's merely a byproduct!"
- The Fraternity of Dirt #66 -
Just because it's dirt doesn't make it low-tech.