Scott - IMO, the elevated Ca and Mg levels *edit at a salinity of 35* (high 500s and 1500+ ppm, respectively, in my case) in Oceanic are tough to deal with. I'm quoting Mike/mojoreef here on the subject (the 1290 & 1260 are in reference to Mg), and if you are interested in the full thread, PM me. Also, dosing a supplement would vary from tank to tank based on consumption. Your calcium demand to keep levels in the 400 ppm range may be different than mine, make sense? Or, are you looking for a 400 ppm in the premixed water?
Here's the quote from Mike:
Quote:
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Originally Posted by mojoreef I agree starting a little lower is alot easier to fix then when the levels are at the point of saturation. NSW at a salinity of 35ppt or 1.026-5 is supposed to be 1290, IO comes in according to bingmans testing at 1260..good enough. Calcium at NSW levels comes in at 415, Io is a little low at 355, some were in thier and alk should be 7-8 dkh, so again a little low. The way I see it is that regardless of it being low I have to use a reactor or additives, so no real concern thier.
The big problem with the oceanic is the mag., If were normal and it was just calcium it wouldnt be a problem, you could balance it with alk and call it a day. But with the mag so high, it take the alk out of the picture and calcium runs wild and your buffer is gone.
Calcium inhibits growth in corals so running the levels so high is a big stress factor on your corals. They have a built in system to remove the calcium and waste it onto thier skeliton, but carbonate is what they use, and when you dont got it, it dont happen. |