Yes, like Method said, the secondary tank my group has is currently a "Dirted tank".
In order to do this my group and I were guided through the steps of successfully creating a "Dirted tank". First we emptied out the tank and then poured about an inch of potting soil in the middle (not touching any of the edges of the tank except for in the back). After that, we capped off the soil fully with an additional inch of Black Diamond Blasting Sand substrate. Then we carefully poured water back and red root floaters afterwards.
For the future layout, do you think our new tank's base should be flat or mountainous, and why?
On the other hand, to anyone who has had any experience with a "Dirted tank" what are some things that we should watch out for? Also are there any tips you would like to give?