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I have 4 clown loaches in my community tank. One of them appears to be healthy, but is very pale in colour. Is this normal, or is he sick, and I just don't know it yet?
Clown loaches change color like I change undies *grin*
If your parameters are good, and there is no change in behavior, its likely your clown is simply displaying his mood. My clowns will "gray out" when they are fighting over food. Its part of the dominance play. Do read the article here from loaches.com and see if it fits your situation: http://www.loaches.com/markings.html