Coral growth vs mg level....

[miserkris]

Just in general, do corals grow well and faster especially SPS... when mg is lower or higher....than the recommended 1450mark?
Thx

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[thegrun]

I do not think it makes any difference at all. Higher levels of Mg will allow you to keep your alkalinity and calcium at higher levels however and that WILL make your stony corals grow faster.

 

[Ron Reefman]

I do not think it makes any difference at all. Higher levels of Mg will allow you to keep your alkalinity and calcium at higher levels however and that WILL make your stony corals grow faster.

I'd change what thegrun said just a tiny bit.

Too high isn't an issue (up to a point of about 2200ppm anyway), too low can inhibit stony corals (both lps and sps) from taking Ca and alk out of the water to make skeleton. Higher levels of Mg along with alkalinity and calcium at higher levels MAY ALLOW your stony corals grow faster. There is no guaranty that they WILL grow faster as there are lots of other factors involved as well (other water parameters, flow, light, food, etc)....:beer:

 

[nereefpat]

Seawater has a Mg level of about 1290ppm, just fyi.

 

[Sk8r]

The reason I keep mg at 1350 is that your alk and cal destabilize re the kalk addition when it goes below 1200, and I want just a little more leeway. Mg is consumed slowly, but it can stand to be a shade high. Get TOO high and you'll be scraping coralline off your glass...a lot of it.

 

[thegrun]

I'd change what thegrun said just a tiny bit.

Too high isn't an issue (up to a point of about 2200ppm anyway), too low can inhibit stony corals (both lps and sps) from taking Ca and alk out of the water to make skeleton. Higher levels of Mg along with alkalinity and calcium at higher levels MAY ALLOW your stony corals grow faster. There is no guaranty that they WILL grow faster as there are lots of other factors involved as well (other water parameters, flow, light, food, etc)....:beer:

Thanks Ron, good clarification.
-Mike