I’m more of a 80 pounds guys. Doesn’t matter much of you keep it clean.
it was towards the back of my tank. I used the back and right glass and the interior overflow box for the three sides. Then I had 3” pvc pipe that was my eel cave that ran the whole length in front of the area. @jestersix did a good job of covering the pipe with rock to obscure what it actually was and in the end it ended up being about 5”-6” tall. He filled the area along the bottom and side so that it would contain the sand. I don’t remember ever having to refill the area.Out of curiosity how did you "build up" an area? As simple as a rock wall dam?
I thought about doing something like that in the past, but always assumed the sand would eventually get blown out of the "dammed" area and then it'd just have a rock wall with a bit of sand on both sides.