thanks bro!
I started without flash also.
But as its a moving target, your shutter speed has to be at least 1/60 or faster.
Depending on the amount of lighting your subject receives, the pic most of the time would be underexposed.
And digital noise would be more obvious in underexposed shots.
With external flash, there are a lot of advantages.
1) you could shoot faster than 1/60 thereby freezing the moving target and eliminate blurness caused by movment
2) subject would be better illuminated thereby reducing underexposed areas which results in lesser digital noise
3) more details can be pick up for example, those stripes/spot on the purple tang
4) could add catchlight or in layman term, sparkle in the eyes to make the photo more lively.
The list could go on and on....
But the trick is to be able to control the beast, (i mean the flash ) so that the subject is just nicely illuminated while the background goes underexposed.
I'm still practising and practising and practising to achieve that
Yes, i have a black background.
But if you could achieve what i mentioned above, subject nicely illuminated by the flash and background goes underexposed, then it doesn't really matter if your background paper is black or blue etc....
Other than the lighting consideration, the other key factor is to choose an aperture to have just enough of your subject in focus while the background is thrown out of focus.
In summary, visualise this, the subject is nicely illuminated and in focus against a dark and blur backdrop
Since you already have the gear, keep shooting.
Don't give up
The reward will be worth it