Mmm. FIrst, it takes 4-12 weeks to cycle, unless all live rock and fresh to boot. Secondly, something's wrong, so it's time to change what's being done. Stop adding fish. COncentrate on inverts and maybe even soft coral until you can get those happy. Quarantine a fish, but don't put it in until you're real sure of those parameters. I'll give you ones to shoot for. Temp 79 degrees, day and night, no spikes; 1.025 salinity, no variance (use an ATO system); 7.9-8.3 alkalinity; 420 calcium; 1300 magnesium. Hit these, and hold them for several weeks before you have a fish. YOu need your own tests [I recommend Salifert brand], your own supplements, and you need to test and log your test results once a week at least.