Question 1, Calcium

[StirCrazy]

Originally Posted by Ruth

ZEOmag is a pure magnesium granulate to be used in calcium reactors (5-15% of total media volume) to maintain magnesium levels. Magnesium is easily added without chloride and without disturbing the ionic balance in your tank. Granulate size 6-12 mm.

Interesting, I think there is a little misleading info in that sales add though. Pure Mg is a soft metal that is very flammable so what they are selling isn't pure Mg But I wonder what else you are getting with it? It looks like it might be good to try although it is expensive, I would be looking at 50.00 to add 15% of my reactor media..

Steve

[Ruth]

Compared to some other things that I buy for my aquariums $50 doesn't seem that bad and as I understand it the 15% will last as long as the reactor media so in my experience at least 6-8 months. I suspect that it is probably some kind of dolomite (I think that is what it is called) material. I'm going to put it in my reactor on my 230g because I have to add new media to that in the next month and on my 190g it looks like I will be another 6 months or so before I have to add any media so it will give me a chance to monitor if it makes a difference.

[Bartman]

In any article I've read (eg. http://www.advancedaquarist.com/2005/12/aafeature1 ) the Ca for NSW is generally referred to as 410 - 420 ppm. Evolution being what it is, why would we shoot for anything outside this range?

[StirCrazy]

Originally Posted by Bartman

In any article I've read (eg. http://www.advancedaquarist.com/2005/12/aafeature1 ) the Ca for NSW is generally referred to as 410 - 420 ppm. Evolution being what it is, why would we shoot for anything outside this range?

because the average Ca in NSW is 400 . it varies a little in various parts of the world. I think reefers have inflated the numbers over the years thinking it is better. so if we look at the average we could easily guess that maybe we should be looking for 380 to 420. but there is also something else we should be looking at, Mg? nope it won't cause a problem or difference in Ca unless it is low (and that isn't from some book ) but Alk, Alk will allow your Ca to either go above normal, hold it at normal or let it dip below normal depending on its concentration. personally I don't know of any reef tanks that are perfectly balanced. I used to go for the higher Ca thinking well if 400 is good 450 must be better but found it wasn't over the years. I have found the chemistry that work the best for me is a Ca of about 380 and a Alk of about 13. now this is just my findings others might find different levels, but I think the "well if 400 is good 450 must be better" attitude has been creeping levels up for years.

Steve

[Ruth]

I have been guilty of the same thing as Steve - if 400 is good then 450 must be better and 500........whoo hoo. My experience has shown me that if I shoot for calcium in the 400ppm range and Alk/DKH in the 8.5 range I seem to have the most success.