Black marks on my moorish idol and powder blue

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Lefeta

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Hey everyone, just wanted to know whether anyone has experienced this before, and if its normal? I’m just concerned because my powder blue had similar marks 2-3 weeks before dying of an unknown cause. I’ve had the Moorish Idol for almost a week now, but his been eating well and has showed no signs of weakness or irregularities.
Tank:
- 350L
- Salinity: 1.025
- Temperature: 25 Degrees celsius
- Ammonia = 0
- Nitrates = 8ppm
- Calcium = 400ppm

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