I can't see anything in those pictures, but the Mandarin is a special fish for a couple reasons. One of those is the excessive slime coat which goes a long way to protect them from Ich. It's not totally impossible for them to come down with Ich, but it's much less likely than other fish.
The other thing with them though, is the fact that they really need a well established and large system to do well. They don't adapt well to daily feedings, or commercial food and really need to hunt pods in the tank to survive. This is one reason that QT is often not recommended for this particular fish. I've seen lots of different recommendations on tank size, but most tend to agree that a 120G tank that is at least a year old without other pod predator's (like scooters or other mandarins) should be sufficient for them.
Whiskey
