Yellow sponge like thing in my gsp

Franki

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So this yellow thing has appeared on my gsp. I think its a sponge. Ive seen smthg similar while diving and i use sea water in my tank so thats probably it. What do you guys think?
P_20190316_195556.jpeg
 
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Franki

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Thx everyone. I suspected it was harmless, thank god.
 
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