Bought this primarily for my amano shrimp/mystery snail but my betta rarely hung in it. Everything is very smooth, no sharp edges around the hole and on top. more than big enough for the betta to safely pass through. In addition, it is very easy to clean. I just brushed it lightly with a toothbrush and the algae came off really well. As far as I can tell it hasn't changed or affected the color of my water.
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