Help with hight alk and low calciume

[fhd]

I test my water last day my tank 200 gallon and the problem is the calciume is low around 200 ppm and the alk is high 15 magnesium is 15
What should I do now to rise calciume and reduce alklinaty?
I had seachem fusion 1 and 2 but I try to avoid to add full portion of fusion 2. My tanke is 50 days old. Any idea? Thanks in advance

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[civicdemon]

what test are you using to test and are you mixing your own water or getting it from LFS ?? Have you cycled already ??? any corals fish in the tank ??

 

[fhd]

Yes I am mixing my own water it was shown me around 350 380 for calciume and there are some fishs also yesterday I add 3 corals mashrom and bubble and flowerpot it was stable around 380 400 but now it is 200 high magnesium haigh alklinaty what to do??

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[civicdemon]

What test kits havre you had it tested by a LFS or someone els ???? Are you sure the Tank Cycled ?? Ca. should not drop like that with almost no corals. What salt are you using ??

 

[rcreef]

Have you just add ro water to the tank in the last 50 day or have you make water change? When was the last time you test the water b4 you got the new resolts

 

[fhd]

Have you just add ro water to the tank in the last 50 day or have you make water change? When was the last time you test the water b4 you got the new resolts

Yes I did two or three time one of them big water change after cycling done, I was test the result b4 2 week it was ok but now from yesterday it is not good, I add magnesium supplment b4 1 week or more only half portion, and I add with it fusion 1 and 2 maybe the fusion 2 not good it includes alk like purple up.

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[reefes pieces]

I'd stop dosing and do water changes. you may be overdosing the alk and mag and its causing the cal to precipitate. Also take a water sample to your LFS to verify your test kits.