When did you set up the tank?
Something doesn't seem right... This tank has been up for 4 months and you have NO3 issues.. What are you feeding your tank and how much? What skimmer are you using? How is your bio load (light, med or high)?
You might want to have someone look at your tank and test with good kits..
What are you considering high nitrates...?
so im using red sea test and it comes in at between 4 and 3 ppm....lmao so 3 duh...lol..but when I used test strip it reads in access of 200? im going with test strip considering I used a small sample of water I got from some cheato bigbranecle gave me....and I moved tank I moved it with sand and a bit of water still in it (HEAVY AS ALL GET OUT) I stirred sand at first then added new live sand. been reading not good idea to stir sand