I have never added any filter food to my tank, IMO it is unessisary unless you have tings that NEED it (which are also IMO things best left to established tanks and experienced hobbiests). if you add a second ocellaris clownfish get a much smaller one, so that it will be male, almost always (99%) of the time when adding a larger fish you end up getting two females who will fight to the death. if you cant find a smaller one get one about the same size as the other.
also, keep an eye on that ric, it might just be the photo but it looks a bit bleached.
other good fish would be firefish, small gobies and inverts, which are always fun. I would recommend skunk cleaner shrimp, peppermint shrimp, and fire shrimp, possible a CBS if you dont mind the size of them.
good corals are softies, low light LPS (euphyllia sp., candycane corals, ect), and if you are up to daily feeding sun coral would do well in low light, but they need to be fed every day with small meaty foods. mushrooms, paluothas and zoanthids are also good choices, as are rics.