ankilinity raised by Mg?

[Reef_kid]

a friend dosed his tank with magnesium due levels being low
and his ankilinity {sp} rocketed
is this due to the Mg????
he was haveing problems already with it being unstable!![/b]

[StirCrazy]

what did he use to raise his Mg?

Steve

[MalHavoc]

It's possible that he was measuring "general hardness" rather than "carbonate hardness". The latter is generally unaffected by Mg levels, but the former is definitely affected, since the Mg:Ca ratio in sea water is usually 3:1.

Having a high Mg level helps you maintain a high calcium level, by the way.