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I'm thinking of using sand around the edges to hide the pondfoam. But I'm not yet 100% convinced on this idea
I had considered using pea gravel to hide the filter foam in my latest false bottom design, but in a previous version that's been running for a year, exposed gravel has been a good place for algae to grow.

Whether or not it does the same between the glass and the filter foam remains to be seen because the 2nd version doesn't hold as much moisture against the glass, but I think long term I can either live with the foam and scrape the glass if need be, or just cover it from the outside with a vinyl wrap or something.
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