Aloha,
I don't know, the pics show the Tang covered head to tail with dark blotches like a skin discoloration. That link is for Black Ich, so called because it looks like Marine Ich. These are neither tiny black spots nor tiny white spots.
Tangs change color and can become blotchy when they are stressed and during the night. The recent move is definitely reason for stress.
The pH of 7.5 is very concerning because it is also stressful.
Why is pH that low, isn't there enough gas exchange
pH levels follow Alkalinity to some extent. What is the Alkalinity reading
Has pH always been around 7.5 in this tank
Providing good gas exchange means two important conditions are met:
1. Good exposure to fresh air.
The most common reason for the deficiency is that the hobbyist leaves the standard glass cover over the tank and/or the home is closed up creating air with lower O2 and higher CO2 than outside.
2. Rapid water movement at the surface.
The most common reason for this deficiency is inadequate water movement and/or powerheads placed near the water surface pointing down instead placed lower in the tank pointing up. The surface of the ocean is constantly rippling and crashing. Replicating this to some extent in our tanks makes everything do better.
There may be other issues, but I would first address pH and Alkalinity.
As I took another look at the pics (it would be great to see a full tank pic), I see what may be a younger tank and the rocks look pretty clean, maybe around 3 - 6 months old, right?
What is being fed
What was being fed by the previous owner
Is there any Macroalgae or Nori being fed
If there is a Refugium, can the Tang be fed some Macroalgae
What other fish are in the tank
I know this is a barrage of questions, but these are what come to my mind as I think over what I would ask myself as I tried to solve the mystery.
Mahalo,
Mark
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