Weird marks on albino loach

[FishKeeper442]

I have an albino loach that I just noticed a few marks on. All levels in my tank are good and nothing new has been introduced to the tank other than water changes. It’s acting normal very active and feeding. It almost looks like scaring however I never noticed and injury. Any input/help is much appreciated.

 

[fishorama]

I've never kept weather loaches, but even albinos can show some "pink on white" color/striping variations I believe. I've always wanted to keep them! So I've done research on them. Your last pic seems to show more red/pink by its head & back from mid-body, I'm not sure that is an issue or a camera/lighting angle.

Whenever I have concerns about fish health, I change more water more often. What size is your tank & how long is your loach? Most loaches are social & would like a friend or 3 if that might work for your tank size, say, 4ft x 1.5 floor space. (a 75g or more in the US). Maybe 2 in a 4ft 55g. 3 might be pushing things. If you have health concerns DO NOT add any fish soon.

Do you have other fish in that tank? What & how many? What temp do you keep its tank? Weather loaches tend to prefer cooler temps, upper 50s-low 70Fs. They can "handle" higher...but it will likely shorten their lives. Do you have sharp rocks or substrate that could injure it? I don't see an injury...

 

[FishKeeper442]

The last picture looking more pinkish/red is an angle/lighting issue. There are currently 3 loaches in this tank it’s a 55 gallon but is a temporary setup. I plan to get them a larger tank and one on their own whenever that becomes possible for me. There is currently a couple of plecos, one tetra, and 3x headlight taillights. I’ve been keeping the tank right at 72 and everything seems to be very active and comfortable. The loach in the picture is 4 1/2 inches and the biggest one is 7in. I have no interest/intension to get any more fish until I can get these guys into something bigger. The substrate is just black sand and I’ve been very picky about the drift wood and rock that I added to make sure there was the lowest chance of them getting hung up on something as they can be rather destructive when scavenging around.

 

[fishorama]

Sounds good! Like I said, when in doubt, change more water more often. Your tetras are not likely too happy with 72F, most like temps a bit warmer. But it also seems as if they are older fish & maybe dying off? What kind of plecos? Some are fine at your temp, some are not.