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I have never had loaches before, so I don't know much about them. I just bought a black Kuhli loach yesterday. He was solid black, but sometime since this morning it has turned a pale orange. Is this normal, or might there be an issue with my tank causing the problem?

Hi, and Welcome to Fish Profiles!
Could be a couple of things. At best, it is settled in
a tank that it appreciates with the correct water chemistry values (pH, GH, KH, Nitrate, etc) lots of places to explore, and tankmates that don't need to be viewed
as enemies.
The oppposite of the above could also cause a shift in
colors. If the tank is less than a month old, it is
probably still cycling and the Ammonia nitrite, and nitrate
readings could be all off the charts and the water toxic
to the fish.

Check your water chemistrys with a quality test kit,
be sure the heater if functioning correctly and that it
is set for the prefered temperature for your fish.

Lastly, read up on the fish you just bought! Either from
books, or go online and see what that species needs to
survive and look its best..
Frank

-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--