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Any ideas on what this is? (1 Viewer)

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Fjmm91

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Found this on the side of my tank. I have no idea what it is or what would have left it. Any ideas?
 

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Fjmm91

Fjmm91

Supporting Member
Build Thread Contributor
Joined
Mar 13, 2020
Messages
174
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183
Location
Houston
My tank consists of
2 perculas
6 hermits
2 rock boring urchins
5 turbos
5 nassasirus
1 regal tang
1 yellow tang
1 tomini tang
1 desjardini tang
1 red coris wrasse
1 mandarin goby
1 banggai cardinal fish
 
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