Thanks for all your comments!
After watching for a while (now he is hanging around rather bravely) it is obvious that he does not have any pigmentation in the skin (the photos may give you a wrong impression). The correct classification is probably amelanistic; he is very similar to the one on the Wolf's link, but hypomelanistic is a wrong term --- it would apply to a fish or an animal that has melanin pigmentation on the body, and Albert (his name) does not. Black cornea makes him non-albino.
Now, $1M question: how do we breed him? I want a few more, he is really fun to watch. Anyone here who has some experience and is willing to help? (this is one way to make sure there will be a few around!)
My feeling is that breeding khulis should be possible if one really wants to do it; and if he can be bred at all, an amelanistic line can be created in the 2nd generation (it is usually a recessive gene). Of course, right now I don't even know if Albert is a "he", and he is possibly too small for breeding...(about 2in only), and just how much work will this take (the good news is that khulis are small...)
Suggestions are welcome.