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#1
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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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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it! |
#2
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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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