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We host static tours on a subdomain that points to the video tour host.  I can not add meta or optimize any of these video pages and there are thousands.   Should I de-index the entire subdomain?  I am seeing errors for no meta, dup content etc in MOZ reporting. If yes, do I add the Disallow: /subdomain.root.nl/ to the primary domain's website/CMS or in DNS records ?  Our web company is saying the no follow needs to be added in DNS but I feel like it should be added to the robots.txt file if SERP's are going to acknowledge the sub is no longer to be crawled and the primary is no longer to be penalized. Thank you so much in advance!