usually when they just come from the wild that is when i see people having problems with them. mostly melting away,
I have some that are called japanese deepwater and they seem to be doing great for now. mine are from offspring of wild ones, but not straight from the wild. Like Nikon, i do keep mine lower in the tank under low lights for now.
everything labled Japanese is fake. nothing comes from Japan. if it did it is highly illegal. stuff that comes in that doesnt have a name usually gets the deepwater name slapped on them.