What is considered low depends a bit on the person, their medical history, and the particular circumstances. It is also important to compare a person's blood pressure to his or her "usual blood pressure." A SBP of 102 is different in a young woman who usually has SBP 100-105, compared to an older person who has historically registered SBPs of 130-150.
Omega-3 fatty acids, such as those found in fish oil supplements, offer a wide variety of health benefits, including the ability to reduce blood pressure by reducing LDL (or "bad") cholesterol. It is possible to consume enough Omega-3 fatty acids simply by adding more fatty fish to your diet, but it's much easier to take it in supplement form. The best forms of Omega-3 oil are krill and calamari oils.
Often, hypertension can improve with lifestyle changes. In some cases, high blood pressure can go down to normal levels with only lifestyle modifications, particularly if you have stage 1 hypertension (systolic blood pressure of 130 mmHg to 159 mmHg, or diastolic blood pressure 80 mmHg to 99 mmHg), or if you have elevated blood pressure (systolic blood of 120 mmHg to 129 mmHg and diastolic less than 80 mmHg).