I picked up this Harptail Blenny from my lfs around a week ago. He’s been eating mysis just fine and wa scaring normal for most of the time. Until I got home this afternoon I saw him gasping for air on the top of the water while covered in white patches and holes. He is in my quarantine tank rn, as I was planning on moving him to a bigger tank later on. I just did a freshwater dip for around 4 mins and I didn’t see much change. He was the only fish in the lfs display tank and it was filled with coral and snails. I don’t have any meds on hand or available rn besides online, so can I get and ID and anything I can do to possibly save him? He is the only fish in the tank.