Redish (pinkinsh) color on Skunk loaches?

Oct 22, 2002
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#1
My skunks are getting a redish color thoughtout them.  It's darker on some, and others it's hardly noticable.  Is this normal?  They all seem happy, nothing out of th ordinary.  

Here's my setup.

30gal (all levels in normal range, except Nitrates are just above 40ppm)
tank mates:
3 yoyo loaches
5 gold zebra loaches
3 pokadot loaches
1 Clown knife Fish (i know, he's going to outgrow the tank fast)