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Hi Laurent. Hopefully the water change will help. That transparent tunicate may be a sponge. I get quite a few of them - some are small & almost transparent with one or two holes - they almost look like a film on the rock. Others are round & ball shaped and I have one long yellow one on the back side of my rock. I even have some roundish ones that are almost back.
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Excellence in reefkeeping is achieved by mastering the fundamentals, and learning from mistakes.
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