I've had biOrb for ten years now - I'm using my third. I love the shape, the light and the way it looks on my desk. I've always used a ceramic medium, but this latest version seems to require much more frequent water/medium changes. And the medium seems to be filled with bacteria or something else that collects at the bottom. At first I thought I was overfeeding my fish, but I have had three tetras for many years and I have always fed them the same. So, I'm not exactly sure why I'm having problems.
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