石頭上的黑點

[BrianLin]

咕咾石上的黑點越來越多...
活石上沒有看到, 只有咕咾石才有的樣子
上中下都有看起跟光強度無關

這是什麼東西...? 海綿?

似乎沒什麼影響,美觀上差了一點

感覺像是一個菌落...

R2R找到一篇看起來有點相關...
Refs:

Black spots growing on my rock​

Black spots growing on my rock

Hi, recently I noticed some black stuff started growing on my rock. The thanks is around 6 months old. Should I worry? It’s pretty hard to the touch but feels more “slippery” than coralline.

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