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If I want to put stacked rock against the back glass

1521 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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My current SA planted aquarium has a sponge attached to the the rear panel with sealant.

As long as you allow the sealant to dry fully, the sponge will not lift when you add water.

Also this makes for a fantastic bio-filter..... :thumb:

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