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As TekCaT suggests, a DSB is affordable, "set it and forget it" technology. On the down side, they appear to require about a year to generate a stable population of pseudomonas to reduce nitrate. On the plus side, once the nitrate is reduced and a balance is established, the bacterial colony is capable of dieing back to a suitable size to govern the nitrate food source (a self regulating system).
Sea grasses are a great addition to your system, but they are to be treated as a separate entity with their own pros & cons. They can be high maintenance as they require harvesting, may need nitrate supplementation once they reduce existing nitrate, they require high intensity lighting that can cause over-heating and energy consumption, and they are very difficult to transplant successfully.
With patience a DSB may be all you need for nitrate reduction, but any other method certainly helps, especially one that can offer pro-botics and aesthetics.
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