There is another issue other than compatibility and that is starvation.
There is no way that a small tank such as yours can maintain a pod population to keep the mandarin alive. The six line is already going after the same food.
You can only hope that the mandarin will accept fish food and that is a risky decision to make. Please don't do it.
Now would be a good time to consider upgrading your tank to a 6 footer to accommodate the yellow tang you already have (your tank is far too small for tangs) and when the new tank matures add a mated pair of mandarins.
Good Luck
Wayne
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