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Old 07-10-2010, 05:47 PM
SeaHorse_Fanatic SeaHorse_Fanatic is offline
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There's a sponge-like hitchhiker that I've seen on some of my rocks & other people's as well that is black in colour. Harmless as far as I can tell & just adds to the tank's biodiversity.

Its kinda smooth and encrusting.
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Old 07-10-2010, 07:02 PM
Bloodasp Bloodasp is offline
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The underside of my some of my rocks are black. Specially in areas dug out by the goby. And yup i heard those were sponges and normally die off when exposed to light
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