I have been trying to get an updated shot of the tiny loaches alas this is the best i have managed:

It is astonishing to see the change over the last 24 hours (i just wish i could get a picture to show you!) there is much more definition to the head with the eyes really starting to show through. I can just make out the start of some blood vessels.
Behaviour wise, they seem more active today, one of the fry has been free swimming while i was watching but they are easily spooked, especially when the net gets attacked by the other fish. Most of them seem to be hiding in the stones this evening but a good number were out on top of the gravel when i turned on the tank light this morning, much excitement as they dived for cover :-)
The camera i used for yesterday's shot has a much better macro lens but i have an underwater housing for this one which means shots like this of my 2-3 week old loaches:
I now have a misssion to get some good shots of the fry over the next few days :-) I Hope this is of some interest to you guys, from the sound of it the early development of p. cheni fry has not been fully documented.