I actually did this recently, don't think I took any pictures, I bought some egg crate, spray painted it black and just put it behind the rocks, had to cut some notches here and there for the filters.
If I want to put stacked rock against the back glass
what can I use to cushion it? Anything? I was thinking maybe the kind of foam that you put on top of a mattress, but I don't know if that's toxic or breaks down. Maybe a large filter sponge cut in half (or more), since they absorb enough water to not be *too* buoyant?
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