Small and tiny crabs and lobsters(these beautiful creatures are only few mm to cm).
I add caption (common name and size) but some of them I couldn't find ID (If somebody can IDing, please let me know).
1:36 unknown (5mm)
2:59 unknown (2~3cm)
3:09 unknown (3~5mm)
Filmed at various dive sites in Indonesia and Philippines.
Canon 7D, 5D Mark III, 60/100mm lens.