good luck with the pygmy's!
I just got back from bali the other day, and we found some pygmy's on our own.
I know this isn't a "show off your photos" thread, but I thought I post since I just took the photos a few days ago...
here is the pygmy seahorse that lives on the Libery wreck:

That is heavily cropped, with the 60mm lens... he is *really* small, I had trouble seeing it on the sea fan, and I have very good eyesight.
Like someone else said, its hard to get them to face you, they want to turn away.
because of where this sea fan was, and slight currents in the area, I think the shot would have been much harder with my 105mm lens, but who knows.
this one was taken by my wife with her Fuji F10 in padang bai. There were 3 on the sea fan, but I only saw one. This one was much larger than the one in Tulamben.

I think a 105mm lens would work well here. I had the 10.5mm on my camera during this dive, so I couldn't take its photo 
but this was my first trip with a dSLR, so I'm quite inexperienced in these matters.
btw, in Tulamben I did see that little guy move around the sea fan a couple times, he hopped really quickly... it was cool that Alex captured the pygmy sea horse "in flight".
Scott
ps - we got lucky and got close to a nice big Mola Mola also, out of season!
September is definitely the best month for the molas....