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If I want to put stacked rock against the back glass

1516 Views 3 Replies 3 Participants Last post by  tigger101023
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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sublimerjm said:
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.
When you say eggrate, do you mean foam, or the diffuser that I will use under the rocks?
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