If the 6-line is also sick now, it will hide more... can you feed it some garlic-soaked mysis shrimp? Do you have any other remedies that you use?
To get him to "come out" you've got to get him healthy (if he's not). It may still be uncomfortable/stressed by the Tang, which is now gone but may have freaked him out a bit.
ps- your typing is difficult to read.
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Alan
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