mag is usally 3x what cal is when your waters right.. ex: 450 calcium / mag should be = 1350 make sure your alk is 8-12 dKH I use epson salt to raise my mag. I use about a cup of epson salt mixed in 1g salt water to raise my 100, in my 55g tank.. test your nitrate maybe there high. if they are over 20ppm then you need to do %25+ WC. I think my nitrates is what caused my brain to die. I was reading the test wrong for 5 months. thought I had 0, didnt wait 5 minutes for test results per API test kit instructions. defintly feed that thing with the bottle trick..