Diving at Semakau

Had the great one-off chance of diving off the ocast of South western semakau. It was very sudden; the dive company called n asked if i wanted to dive off hantu, i said sure, but in the end we ended at semakau. And i can say that the place is really growing. Lots of soft corals, sporadic popping up of plate like hard corals (fungia??). Water was very silty (vis = 3-4 feet). Current was steadily moderate. A more detailed description:

50-40 feet: Very bad vis. Nearly hit bottom when as we only managed to see it 3 feet away from us. nothing much save the occasional seafan.
40-30 feet: Much more seafans and those single stranded twig like corals popping out of the mud. Some nudibranchs. Some squirts and sponges.
30-20 feet: Alot of seafans and some other corals. more nudibranchs. Appearance of sea urchins. Spotted a large synaptid(30 cmlong, 3cm diameter) and a HUGE knobbly sea cucumber (40cm long, 8cm diameter). More Squirts and sponges. Found a feather star.
20-0 feet: Lots of hard plate corals. Curiously lacking brain coral and staghorn/branched hard corals. Huge bunches of soft coral. Urchins in abundance. Few nudibranchs.

Nudibranchs were found in abundance at around 40 - 15 feet. Moderate amounts of Glossodoris atromarginata (ard 10cm). Some compact knobbly white/bluish phyllidia(5cm) species and some pretty marine flatworms(thought they were nudia at first). There were LOTS of those worm-like ones(3-6cm) - probably from suborder aleolinda - looks like Phidiana indica or Pteraeolidia ianthina with its white body exchanged for purple, with tinges of yellow. Sorry but im not terribly good at identifying nudibranch species. Searched from the sea slug forum's species database. Unless someone could direct me to a better database (ie more picture identification friendly)

Curiously, there were NO fishes to be seen, other than one lone butterfly fish at 40 m and a goby at 30m.There must be some lobsters nearby - some fishermen caught one in their bubu traps.

So there it is - deeper water fauna of semakau. Silty water, bad vis. Cant really compare to hantu or sisters islands, but it seemed good enough. There were way too many nudibranchs and no fishes, so i think theres an imbalance in ecology somewhere.

And, please, can someone direct me to any online userfriendly picture orientated database for marine fauna? having a hard time identifying. Otherwise im going to have to invest in literature. Or break in to Ria's house and nick her incredible database for marine fauna. And darn, i havent managed to get my waterproof casing for my cam, or i would have posted up some pics here.