Just dived in

[sphelps]

Originally Posted by MarkoD

Shoot in raw so you can adjust as much as possible in post processing.

That's probably the best tip anyone can give you

Not to purposely contradict but I'd say that's pretty much the worst advice anyone could give you. Shooting in RAW basically tells your camera "don't worry about it I got this" thus bypassing the processing ability your camera came with. In addition raw files are larger and much harder to work with on a computer since you need special software to even open and view the file. Then you end tuning everything to what your see on your computer monitor which may be very different compared other video sources or printers. So unless you really think you can process images better than the fancy camera you just bought I'd advise against the hassle that comes with RAW format.

I'd say better advice would be to stick with the basics relating to actual photography as appose to relying mostly on manual post processing. Shoot in jpeg and take lots of pictures. Choose an appropriate lens for the subject, the body is only as good as the lens you use. Try stationary subjects first like corals. Stick with auto focus until you get use to the other settings. Aperture priority mode is my preference and what I would suggest you try first. If you can keep the subject still (ie no tank flow) then choose a lower iso setting for better clarity. Try large aperture (small f number) for faster shoots and less depth of field, then try small aperture (large f number) for slower shutter speeds but higher DOF. The DOF because more important in macro shots. Adjust WB as needed, with LED lighting tune your lights more white to make this easier. Once you start getting clear shots with good color you can look at post processing but still no need for raw files. If you have the software most allow you to open jpeg files as raw format to get the same level of adjustment but there's really not much more in there you need.