I had the exact same problem with a pair of Zebra darts. They had a specific hiding spot in an old coral skeleton. I picked it up and rolled it over and over until they finally swam out, removed the rock and netted the fish. These guys also showed no signs of velvet but the tank has to remain fishless for the disease to die off. Some will say 8 weeks but I went another month just to be sure. 12 weeks fishless and all was well.
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