If the slow-growing follicular non hodgkins lymphoma is in the bone marrow, but only 2%, what are the best options for treatment?

Depends on symptoms. The decision to treat follicular lymphoma is not based on the amount of lymphoma in the bone marrow. If the patient has no symptoms from the lymphoma we often watch the patient closely. Many of these patients will not need treatment for several years. If a patient needs treatment for follicular lymphoma the best treatment is currently a combination of the chemo drugs Rituximab and bendamustine.
Sometimes nothing. I assume you are referring to a grade 1 or 2 follicular lymphoma. Watch and wait is an option since this is not curable. Another option would be a clinical trial or single agent rituximab. Hope yet his helps.