Well from what I understand (not an expert by any means on the subject) is the 4 bulb t 5 cannot support sps
corals. For those you will need to add more light. Something you could do later.
Fortunately you should be able to have all soft corals and most LPS
with that unit (which is a lot of different corals!).
+1 on the color comment blue is mostly aesthetic. I personally would have to have some sort of bluish light even if it's just a cheap lunar fixture (in addition to the regular light), it really brings out the vibrant colors of the coral.