Don't do anything but change the water. don't vac. don't clean your filters. don't rinse your filter media. you need to get a good BB colony going and the best way to do taht is to leave all the media where bacteria grows alone.

Check your ammonia and nitrites ever day before you do a w/c. if EITHER or both approach .50 do a 50% w/c to get it down to .25. try to keep it there until both ammonia and nitrites are 0 and your nitrates are less than 20