Hi Eddie
I dive in Dayang too sometimes, being based in Singapore.
BTW here is an example of a cuttlefish shot I took with an upwards angle. Note that the absence of a cluttered background makes the cuttlefish stand out more.
Taken with Canon S45 camera/housing, Inon Fisheye lens, dual Inon D180 strobes. F8.0, probably 1/100.