What is a safe nitrate level for clean up crew

"The large majority of denitrating bacteria reside in your live rock and substrate (or filter media if you use it"
I agree with that.
So a 10% water change IS aggressive. I have been doing 30g water changes in a 180g aquariums with about an additional 40g in the sumps to reduce nitrates and they are coming down.
 
What percentage is "Aggressive" is relative to each hobbiest. I was merely trying to point out that if your trying to correct a problem, IMHO your better off facing the small risk associated with larger(IMO larger than 10%) water changes than letting the problem linger on due to a fear of water changes.
Brian
 
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