As far as the relationship from Mg to Ca and Alk .. yeah, there's a bunch of fancy articles you can read but my main take away from all that is "it takes more Ca and Alk dosing to maintain more gooder levels of Ca and Alk when Mg is low."
So raising your Mg a wee bit (because I don't think I'd worry too much about 1150, although if it were my tank I'd bump up the Mg on the next water change) I'd expect that you might need to bump down your Alk and/or Ca dosing by a wee bit. That said, you might not need to because who knows maybe the uptake will increase thus keeping everything stable, except maybe stuff grows a tiny bit faster. (A bit of a stretch but who knows..)
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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