Found one mandarin goby

[Kabong]

Mandarins have a unusually thick slime coat and are pretty resistant to Ich.
As much as it go's against everything we've learned, Most people add them straight to there main tank.
Your other options are to keep looking for one that's been trained to take prepared foods.
Or you could stock your QT tank with pod's for him to eat.
You must use a tank that's never been treated with copper though, It will kill the pods.