"hills" in substrate?
I am wondering how to create a "hill" like effect with the substrate in my new tank. My old tank I just mounded the gravel petty well but that flatted itself out over time. I'm trying to avoid that in my new tank. Here are my questions:
-I don't want to use rock to support the substrate as this is only a nano tank, so what other methods are available? I have heard that eggcrate is used; is this the soft cardboard or styrofoam kind? Are there issues with "dead" water when you use this method?
Are there any other ways I can accomplish this?