This looks awfully familiar ^_*
If you don't have some sort of pre filter on your skimmer you should get one, it will help keep your fish alive longer. I recommend you get a book or do some investigating before you go any further. A little knowledge of tank chemistry can help you decide for yourself which equipment is needed. The filter you are using, the one you say is old, you probably don't even need. With more power heads you can increase flow moving any sort if decaying debris into the water table and thus becoming your biological filter. Also your nitrates should be zero. Probably because you need more water flow, good flow IMO is the key to good reef keeping. Thant and Alk.