For the wood, it is roots of a tree, i don t know the name of it. (it s not mangrove)I love it. I too have replaced all of the artificial with live. What kind of branch it that? The one with the macro on it? How do the nassarius do without substrate? Also, what kind of shrimp? I'm heading out today for more CUC.
Nassarius do well without sand. At least this specie (N. vibex)
For shrimps i put many different species. Supposed to be feeders but some species will hide better, like Leander tenuicornis or Palaemonetes species, while species like Panaeus species, Hippolyte zostericola or Latreteus fucorum will be eaten pretty fast. I still need to ID many species... also have a lone Lysmata