well, i can't top whats already been said nonn,
my brother in law lives in thailand but i never get pix like that from him, and he's a keen photographer?.
The water temperature was 21C. or about 70F. This should be as cold as it gets for this stream since this is the winter time. The place is about 300 Metre from meas sea level. It does get colder in the stream at higher elevation. Here are two more species from two genera living together.