Your fish and inverts won't bother corals so that's good. The bad part is that the lighting you currently have won't be sufficent for any kind of photosynthizing coral, not even mushrooms.
The kind of lighting you need depends on what you want to keep. Example: if the only kind of coral you will EVER be interested in are regular mushroom corals like the pacific frilly, ricordia, hairy, metallic, et......then I could say to you, get one 55watt PC unit (power compact), get more LR and stack those shrooms on top of the rockwork and everything will be peachy.
The problem is that usually, everyone starts out with shrooms, then decides that hey, they really want bubble coral, frogspawn or perhaps some button polyps. Now you have to upgrade your lighting just a bit. Maybe add a regular strip light to the PC, or perhaps instead of a single 55watt, get a single 96 watt PC....see what I mean? And it gets even worse if you want any kind of SPS coral or even clams! Then along comes the subject of money. These lights don't come cheap, but without them, you won't be able to keep any corals alive......
So either you decide on what particular coral you want, or how much money you have to spend on lighting.