Ca/Alk/Mag Mess . . . How to fix?

[FragIt Dan]

Originally Posted by Enigma

Ugh. That was not the response I wanted. How about five gallons a day? 55 gallon system.

I'm worried about shocking the livestock.

I think you need to balance shocking the livestock with a 50% water change against the stress a 300ppm Ca level is putting on them. I have had my tank almost that low at times and lost corals because of it. +1 on Aquatro's comments... get the Ca up quick.