The first site is Aquamoss

A true gold mine for those who cultivate bryophytes in the aquarium.
The second site Bryophyte Ecology is the digital version of the homonymous book written by Dr. Janice Glim PhD at M.S. University.
Does not explicitly deal to aquarium mosses still contains a wealth of great value informations. In English.
The third site aquamoss.ch is maintained by Sebastian Prati a mossess and shrimps fan.

Despite the name of the site I found only some cards about mosses, however, I suggest a visit to the site for articles on shrimps where stand out the one on anatomy of Caridina sp..