Chemistry question

[Eb1air]

Hey all I have been reefing for a little over a year now n sence have gone from a 55 to 75 n 30 gal sump with 15gals in it reef octopus clasic skimmer mag 12 return and refugium cjaeto n grape calerpia not a lot of fish but have probably 20 corals softies lps n 2 sps montipora n birdsnest but in testing my perimeters are
1.026
Ca490
Alk7.7Dkh
Mag 1500+
No3 0
Ph8.2
Ammonia 0
Phosphate 0
Can't understand why my mag is so high beyond test kit detective
Also my Ca stays at 490
I use api test kits for water nutrients and salifert for chemistry.
Only dosing Doh 15ml daily otherwise it drops off fast and 17 ml once a week for trace elements, 5 gal water changes weekly. trying to give as much info for help on my question. corals look great please help me understand why mag n Ca is staying the way they are and can the mag at some point be toxic at such a high level
HAPPY REEFING

 

[lapin]

While 1500 is not near the harmful level it is high. My first thought was salt mix but then you would have high levels of Alk also.
Did you confirm the mag test at an LFS?
What are you dosing? Name brand or home made?

 

[Eb1air]

While 1500 is not near the harmful level it is high. My first thought was salt mix but then you would have high levels of Alk also.
Did you confirm the mag test at an LFS?
What are you dosing? Name brand or home made?

Instant ocean reef crystals salt and coral up for alk additives . Adding alk to keeps levels up. But by theory the calcium and mag should be being used up along the week but I guess the water change helps it. But I'm trying to go towards the Triton method

 

[lapin]

From the web:
Strontium and Magnesium
CoralUp contains an additional boost of strontium and magnesium to help maintain levels even in tanks with heavy population of corals, clams and coralline algaes.
I have read in the forums of high mag in new buckets of IO. Have you tested your new salt mix? Could be a combo of both and your tank not consuming the mag as fast as other elements

 

[Eb1air]

From the web:
Strontium and Magnesium
CoralUp contains an additional boost of strontium and magnesium to help maintain levels even in tanks with heavy population of corals, clams and coralline algaes.
I have read in the forums of high mag in new buckets of IO. Have you tested your new salt mix? Could be a combo of both and your tank not consuming the mag as fast as other elements

Hey man thanks for that didn't know that makes sence and no I haven't tested my salt didn't even think of doing that .lol duh makes a lot of sense now I feel stupid. Thanks a lot. Going to stop water changes n just dose soon l8ke the Triton method discusses

 

[Randy Holmes-Farley]

High magnesium is usually driven by test error or a salt mix with a high level.

If a supplement has appropriate directions and you use it appropriately, it would be hard to get high levels as the real depletion is only ~2 ppm per day or less (often much less than 1 ppm per day). About 1/10th of the calcium depletion rate. So even if you had no demand, it would take a long time to get it excessively high with a well designed supplement.