Let me chip in abit here.
1) Change water regularly. Best if weekly changes of 30% or more.
2) Best lighting is the brightest you can buy. Metal-halide bulbs. For 3.5' tank, use 2x150W or 1x250W. Warning: they run extremely hot.
3) I personally hv tried keeping corals, and believe its very-very hard to keep them alive for any length of time. Corals just cannot survive in a tank. We can only prolong their time to death.

Corals need these in order to survive:
1) Clean stable water.
2) Super-duper bright lighting.
3) Cold water temp at ave 24degC.
4) Supplements like calcium, iodine, etc...
5) Feeding with micro-organisms, eg. phyto-plankton.
Only go for corals if u can provide all these basic requirements. Dont go half-way, or try-try-see-see. Will only end-up with dead corals n empty pockets.

My advice is read-up and do ur homework before venturing into keeping corals. Its not easy, not cheap, n very time consuming.

Happy coral-ling