Medic5, the above gives alot of good advice. As for my view, just go diving and add to your 20 dives of experience. Enjoy the underwater world and take it all in. Nitirx course in good info but may not be much benefit to what you are doing with single dives. Photo is fun and makes you look for the small critters and share with your friends back home. But without excellent buoyancy control, as noted above, which comes with practice and experience you will not like the photo results.
So, my advice is, go diving and enjoy the fishes.
So, my advice is, go diving and enjoy the fishes.
