hi can anyone halp me i have very high nitrates 80 ppm in all 3 octo tanks. they all have good skimmers wet-dry and 2 ehiem 2217 on each. i do water changes every 2-3 weeks about 20-30 percent.does anyone think a deep sand bed would help its already 3 inces deep. i have tried all types of removers i dont over feed every other day. does anyone have any advice? thankyou. oh and i do have live rock and i took all the bio-balls out a couple of days ago. but now im worried about rising ammonia.