Help

[MOW4T]

one of my guppies has been hanging out in the top corner for a couple of days now, when i looked close today it looks like all its scales are raised makes it look almost armoured.

whats the deal?

 

[WILDER]

How many gallons or litres is the tank.
Do you have water stats in ammonia, nitrite, nitrate, and ph.

Does the fish look bloated.
Any signs of flicking and rubbing.
Get a magifying glass to see if you can see anything under the scales.
Any red sores of red pin pricks marks on the fish.