waahhhhh :(

What alk. kit do you have? If its an API kit,count the drop to the color change.The number of drops equals DKH which should be somewhere between 8 and 12.
KH is general hardness,which is sky high in saltwater to begin with.
 
i lost the little chart thingy but it was about nine drops.. i looked up the chart online and thats what it gave me... but it was 8 or 9 drops
 
You still have Mg to test but it is sounding like its something else. Do you dose any chemicals or is it just water changes?
 
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so far this problem has stopped and i my coraline has begun to grow back over some of the grey spots even... thank god!
 
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