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I have a client with a realtor site that uses IDX for the listings feed.  We have several external links going over to the IDX site for various live custom searches (ie: luxury listings, waterfront listings, etc...).  We are getting a Moz spam ranking of 2/7 for both "Large Number of External Links" and "External Links in Navigation".  Chances are, these are related. My question is this: (1) Being the score is only 2/7, should I bother with fixing this? (2) If I add a rel="nofollow" to all the site-wide links (in header, footer & menu) will this help?  I couldn't find anything definitive in the Q&A search. Looking forward to any insights!!!