Hey all I'm slowly banging my head against the wall as I don't know what up with my tank!! Can't get thr nitrates down must have changed almost 70% last 2 weeks in my 130 gall tank (4 months old) and it's still 20- 40ppm and I keep getting the odd ammonia spike? Just changed 25% and now my ammonia is 2ppm from .25 yesterday? I did feed the fish 4 hours ago but not much. My calcium is 380 and MG 1200 how is best to increase those? Just put some prime in but the 4 fish all look fine and corals are all growing and good! Tanks got loads of bio and rock?? Even been chucking stability in recently. Am I missing something?