sick cardinal tetra. See link complete video. #fishdisease #aquarium

2 Jun 2026 · 0 min
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Gerald Bassleer shows Cardinal Tetras in his tank with sunken bellies and extreme thinness, dying while others in the same water stay healthy and active. The contrast reveals a disease or condition worth watching for in your own aquarium.

  1. very skinny. You can see the sunken belly and some are dying. Here we see in the aquarium some are looking healthy, pretty well, in good shape and doing well, but some of them are just like this Cardinal Tetra.

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