Mention of the drydock at PG brings back memories - there used to be a resident pair of harlequin shrimps about 15 feet away. It's the only place I've ever seen them, or been able to get a shot of one.
Pedro (at Asian Divers) tells a great story about taking some divers to see the harlequins one day. They dropped in about 100 m or so away, and Pedro picked up a blue Linckia star fish to use to lure the harlequins out of their hole, holding the starfish in front of him as he led the group across the bottom toward the drydock. (Needless to say, the local supply of Linckia's in the immediate vicinity of the Harlequin's base was quite limited).
Well, they got there, saw the Harleqins, etc., then did the usual blue-water ascent. On the surface, one of the divers exclaimed "That was incredible."
"Oh, you liked the harlequin shrimp, did you?", asked Pedro.
"That little shrimp. Yeah, that was okay. But what I thought was incredible was how you navigated using the starfish. You've gotta show me how to do that."
(Now I can share Pedro's secret: always swim in the direction that the middle leg of the starfish is pointing!) 
Here's the harlequin from the Drydock at Puerto Galera:


Robert