It looks like you didn't use enough silicone on top of the foam. I just put it on so thick that you couldn't see any more foam.

I made 2 practice tanks to see how well the foam background would work. My biggest mistake was working too fast and putting on the silicone and coco fiber too early. Within a week the foam had shrunk away from the side walls and I had to do a lot of patch work. All in all they turned out nice, but I found I like the cork bark and foam background the best.

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