yes, diabalous is correct. I am battling high no3 for 3 months. slowly very slowly but surely it is decreasing. I took out my "mature" sweetlip and damsels(reduce LS) . I feed much much less. once every 2 days.(cruel but must), and I get more LRs. EMM NO3 drop half from 100 to 50.so now is u bet . reefing all depends on ur self. trust uself. learn from other accounters. Which everyone here is doing. we share views u execute to ur very best instict. emm just my view. me only sincau learning too. he heh e.