Nitrate

Really depends on high they are at the moment and how large your tank is. I do weekly 10-20% water changes. Althought its main reason is for trace element replenishment not to lower nitrates. You need to ask yourself why your nitrates are so high. Over feeding is a big one.
 
change 20% or even more(depending how high, no more then 50) then test the water and see where your at then I would wait a few days to change again if necessary, then test the water again to see.. In between waterchanges you want to let things settle back in before changing more..
 
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