My take:
Points 1 and 2 - cleaning the tank and not using the flash are good common sense tips.
Point 3."Adjust your aperture to let more light into the lens. If your camera allows you to do so, experiment with the f setting, for example, set your f to 1.8"
Not a bad tip, but for someone new trying to shoot at 1.8 is a pretty narrow field of focus, and many lenses that allow you to shoot that wide open is out of the lens' "prime zone" - most will find shooting moving fish at 1.8 very difficult because so little of the field is in focus. For extreme close-ups with a macro, on a tripod, then feel free to go this low. Otherwise, I'd move into a Av of 5.6 to 11 and work back from there as you get comfortable.
4."Adjust your speed or ISO, increase it as you take a series of pictures to see what is the best setting for you. You can start at 200 and run it as high as you can. If you have a setting for action shots, try that. The faster shutter speed can help with taking a good photo when the subject is constantly moving. Also, if you like coffee like I do, the higher speeds will offset your hands shaking a bit as you hold the camera. You can also try using a tripod to help with getting crisp focused pics."
There is a point where higher ISO will produce more noise. I'd try to not go over 640 or 800. Otherwise your pictures may look grainy or noisy.
5. "Do you find that the blue in the tank seems to wash everything out in blue once you view the pic? Well, if you are running a dimmable light, much like our Wave Micro or Wave Mini, reducing the blue until it renders a more realistic color is the solution. I usually take a series of pics, slowly adjusting the blue and white channels of light until I get the most pleasing of pictures. I find that I usually have to turn the light way down before the pics start coming out decent."
Shooting under bluer light is more difficult. Alot of this has to do with proper WB'ing in camera and in post, regardless of the lighting. While these tips are good, he hasn't addressed WB at all which is the starting point for aquarium photography in my opinion.
6."Don't forget auto focus! Trying to manipulate your focus while taking that perfect shot can be difficult and annoying."
And don't forget manual focus! Alot of macro shots are easier to focus manually, and for moving fish, a lot of times you can focus manually faster than your AF "hunting" for a fast moving fish and being unable to keep up.
7."Play with macro. Often cameras will have a macro setting to allow for very up close focused shots. The setting looks like a flower icon on the dial selector of your camera. Experiment with this and very close up focused shots, you will be amazed by the detail you can render."
This is obviously related to P & S cameras.
8.Shoot Shoot Shoot"¦ - very good tip!
9."Try different angles, tilting the lens and snapping shots as you move and the camera focuses. Constantly hold down the shutter button, allow for refocus, and then fully press."
Generally the only angle that is going to produce a clean crisp in focus shot is one where the direction of lens is as perpendicular to the glass as possible.
10.Take a break - good tip, patience helps.