If your nitrates are really that high (after about 50 ppm it is hard to tell the difference iwth my kits) your first step (IMO) should be to get the nitrates undercontrol. Your best bet is to get a refugium inline and ditch any sources of nitrates (hang on filters, canisters, other mechanical filtration units, porous media-is that gravel?). If you hunt around you should be able to find a hang on back refugium that you can fill with macro algae for a reasonable price.
Other thoughts:
Your alkalinity is on the low side but it is not detrimental, regular water changes with a quality salt like reef crystals should adjust your parameters to acceptable levels. New bulbs would be beneficial for asthetics and for organism growth.
My quick recommendation is weekly (maybe even every 4 days) waterchanges with a quality salt until your nitrates are down to around 20 ppm and then go to weekly or bi-monthly and work on a getting HOB refuge. Good luck!