albee,
I notice the seeming absence of a clean up crew? Very few snails visible. Do you clean the glass and sand manually, does the trigger eat the snails and crabs, or you are just lightly stocked on clean up critters at the present?
Also curious about the angelfish - it doesn't pick on your LPS corals?
Lastly on the 4 medium sized tangs? Are these all getting along and how long have you had them?