Please tell us more about your reefkeeping experience? Do you own a tank (or multiple?)?
If you already own a reef-tank, please elaborate on the specs of the tank? (hardware/filtration/lifestock?)
are you new to marines as well or just new to our forum? tell us a little about yourself and your history (if you have one in marines) or what you would like to achieve?
Now, before we can answer your question, we need some indication of your level of experience in this hobby, and what setup you've got. Why don't you start off by posting a thread in the New Members - Marine Aquariums of South Africa forum, and tell us a bit about yourself - your experience level, and your equipment (tank, etc.). This way, we can give appropriate advise.