What happened to my loach overnight???

My weather loach was fine yesterday. Healthy, active, and colorful. I came home and found him pale white, and wrinkly like he's gonna shed his entire skin. He is also lethargic. What is this??? I've read so many forums and haven't found anything like it. Attached are some before & after pictures.
Please Help.

bunniidavis said:

My weather loach was fine yesterday. Healthy, active, and colorful. I came home and found him pale white, and wrinkly like he's gonna shed his entire skin. He is also lethargic. What is this??? I've read so many forums and haven't found anything like it. Attached are some before & after pictures.
Please Help.

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Could you give more information about your tank?

That behavior is generally temp related or food but it can go deeper than that. Like meg said we need the dets on the tank

Hard too see from the pic but that looks like an excess of mucous (slime coat), which means something in the water is irritating him. Do a 75% water change using dechlorinated water.

As Seangee said, excess mucous caused by something in the water.

Do a 75% water change and gravel clean the substrate every day for a couple of weeks.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Check the water quality for ammonia, nitrite, nitrate and pH.

Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media/ materials in a bucket of tank water and re-sue them.

Make sure there are no chemcials or fumes getting into the tank, and your hands a re free of soaps, perfumes, oils or anything else that could poison the fish.

Make sure the fish buckets, hoses and nets are clean and free of chemicals.