The 1st one is just a small cube and some of the fishes and corals are not very healthy. The Regal Tang (scientific name: Paracanthurus hepatus) is suffering from a bad case of Saltwater Ich or white spot disease. I love the yellow Banana Wrasse.
Links on the fish and ich are shown below for reference:
- http://en.wikipedia.org/wiki/Paracanthurus_hepatus
- http://saltaquarium.about.com/od/ichparasiticdiseases/a/aa_cryptocaryon.htm
http://en.wikipedia.org/wiki/Yellow_tang