So I have 20 gallons. a long tank with a male betta, corykets, ottootok and lots of tetras. I love these two hiding spots, my fish love them. The size is just right for my tank and my fish like to hide. I ran my fingers around the edges and didn't find any sharp edges, but because of my betta I sanded a bit for nothing at first. I also noticed that they are not too heavy and the surface is not rough. Really very satisfied!
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