My niger trigger has been doing this for nearly 2 years now. He is hiding in his cave all day long, only coming out for feeding and then returning to his cave. Once in a while he comes out, have a little swim around and back into his cave. That's it, that's his life.
I have absolutely no aggressive fish in my tank, a cleaner wrasse, copperband butterfly, a few cardinal, 2 occelaris clownfish and 2 mandarins. No aggressive fish at all. I never understood why he was so shy, as he never was attacked by anything.
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More fish die from human stupidity than any other disease...
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