Is something wrong with my Kuhli?

[KRL]

Hi! I've got 5 kuhli loaches, and recently I noticed the biggest one has lightened down the side of its body. It's not the complete washout of colour like when they're unwell, but like a strip along it's body. There also seems to be a red stripe. I'll attempt to attach a photo. It's still behaving normally whenever I see it, lounging and eating. I'm worried it's getting fat and scraping itself when it squeezes under the driftwood (I have soft soil substrate. Any ideas on what it is or what I can do?

 

[TMaier]

Khuli's can look a little washed out at lights on in the morning. Is it eating?

 

[KRL]

Khuli's can look a little washed out at lights on in the morning. Is it eating?

Yeah seems to be! Seems like a normal kuhli otherwise