I had the opportunity to visit the Philippines which is known for an abundant and diverse marine ecosystem with lots to shoot.
#1 is a Hermit Crab that was guarding its territory and did not retreat from me.
#2 is one of the many colorful Nudibranchs (Sea Slugs) that populate the area.
#3 is a magnificent Goby and a Shrimp that spend their entire life together tending to each others needs.
Macro photography in Anilou
Great pistol shrimp and goby shot. It can be hard to catch them both out. Looks like you laid the camera just above the sand and patiently waited :)