i dont feel i could give you good advice on the lighting so i wont, but the koralias are good pumps, it depends on what you plan to keep and how you direct them as to what they will do in your tank, id have 2 4s in a 125 at the sides as its a large tank, and perhaps add a 2 or 3 at the back pointing to the front, it depends on what flow you want, probably best to start with fewer, and add them if you feel you want more flow, buy too many and it may be awaste of money, however 3-4 will probably be fine in a tank that size