Very High nitrates please help

Well that's a good thing, since IME high nitrates are often accompanied by generally acidic conditions and lower alkaline reserve. I wish you success, it can be a process, but they can be lowered. Please post your success so others will benefit.
 
One more thought, have you tried using RO water for water changes? If tap water is used, have you tested that water for nitrates?
 
i don't use a ro but i do use a water purifier and nitrates are at 0. i did up the flow in my refuigium hoping the 5 inch sand bed in it will help
 
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