View Full Version : Help with Magnesium Issue ... Thanks

10/31/2006, 05:16 PM
For the past few days, my magnesium levels have been at 1500-1550. Usually they are right at 1375. Is this bad? What should I do about it?

Tank parameters:

Temp: 80
Salinity: 1.026
Calcium: 450
Alkalinity 4.5 meq/L
Ph: 8.25
Ammonia, Nitrite, Nitrate: 0

I have done nothing different recently. Weekly 10% water changes with reef crystals. Daily dosing with B-Ionic. Top-off with Ro/Di.

I don't dose magnesium.

Is this something I should be worried about?


10/31/2006, 05:29 PM
Mine has been around 1500 for 6 months with no problems. I was using IO salt and had to add Magnesium to get it above 1000. I then switched to Reef Crystals and now it hangs around 1500. Seems OK. Curious what others think.

11/01/2006, 12:07 AM
what i would do is check the magnesium again.. clean the vile u test in competely.... check with someone else test kit as well to verify ur results.. and if it truely that level then u could do a water change depending on how big ur system is... if u really want the mag. level to be at 1375 ppm..

11/01/2006, 01:08 AM
i've used Reef Crystals one time in 16+ yrs. and it was never that high. i"ve tryed one other brand that was high ALK. but none ever above Mg of 1375. i use IO only and add Kent Tech-M, Randy's recipe for CaC12, and Kalk. Kent, dKH buffer. and i only have to add very little of each to get to desired parameters. i agree with "tonyscoot84" about cleaning and/or using another test kit. good luck and happy reefing. :smokin:

Randy Holmes-Farley
11/01/2006, 06:41 AM
I expect it is OK, but I'd try to let it drift down.

FWIW, magnesium can't rise that much without big supplement additions or using a salt mix with very high levels. It may just be a testing error if you did not use a supplement or use a salt like Oceanic.

11/01/2006, 07:48 AM
My new thought is that maybe my salinity is higher than I think it is due to a refractometer issue (seems to be the new hype on the board). I am going to check that out before I do anything crazy related to my magnesium

Randy Holmes-Farley
11/01/2006, 08:10 AM
That could be. That would be a big jump in salinity, however.
Let us know what you find. :)

11/01/2006, 01:00 PM
That is a good point, I hadn't thought about the jump, just that it is high. My salinity has been constant. I will take a water sample to the lfs this weekend just to be sure, though.

Randy Holmes-Farley
11/01/2006, 01:29 PM
OK, good luck. :)