Fish tank granuloma is caused by Mycobacterium marinum, a Gram-positive, acid-fast, non-motile, aerobic, non-sporulating, photochromogen bacterium. M. marinum growth is usually slow: 2-6 weeks on Löwenstein-Jensen medium, at the temperature of 25-33°C. In culture, with a light source, the colour changes from white to yellow, because of the accumulation of carotene crystals.
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