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I found my cucumber on my protein skimmer and I flicked him down because he's been up there for 2 days so when I saw him float down it looked like something has attacked it but it is still moving. Any ideas?
The toxins would be released fron its anal area so I understand. The pic suggests that smoky stuff is coming from the body/possible wound. Still, I wouldnt take a chance.
I'm saying that since it did release something, I'd do large water changes and have some carbon filtration working to remove whatever it released. Again, read the link.