PlanetCatfish.com

HI PPL!!
Today i have been in LFS, and guy who works there has promise me 2 L136b for me... but when i have looked in the tank, i have noticed that some are changing color..?!?!
I don't know how to explain, but it looks like there color is fading on some places on the body...
Looks like black pattern has somehow losen its blackness...
It dosen't look like a dieases cuz i dont see any visible markings, but i am no expert in dieseases...
Can anyone help??
Is this normal or these L136b are sick and they need medical attention???
Thanx in advance, hope for really quick response, cheers
V.S.

Don't know anything about the L136b but I have seen this in plecs that are stressed. Do they have plenty of cover?

Well , they have one mopan wood in tank... but there is near 6 little loricariids in there so i don't think so...
One thin that is confusing me is a pic in Cat-eLog... on some pics they are black as night, and on some pics they are greyish...
I don't want to see them dead...

They look similiar like color variations in pics of L004!!??
I will try to take a pic next week, so it will be better to judge when you see little buggers...