Frogspawn and hammer corals losing head

[Coleus]

Well, my frogspawn and hammer corals are dying.

They keep losing one head per day. It is not brown slime but shrink and fall off. I notice this problem after i start doising my vodka. I started out a very small amount but increase the dosing over a week.

I have stopped the dosing now but they are still dying. Someone told me that it is because my potassium is low, is it true? I am not sure what is going on anymore.

All my other corals are doing fine except for brain corals but I think they are being picked by the angel fish.

Any suggestions of what i need to do. My water parameters are

Mg: 1380 - 1400
Alk: 10
Calc: 420-440
Nitrate: 15 (I knows it is high but i has been like that for long time)
ph: 8.2 (test kit) 8.7 (ph probe, calibrate it twice and still the same result, probably broken probe)

Potassium: no idea because no test kit

[Seamazter]

Potasium is required for a low nutirent system like zeovit, or in your case vodka.
Even if this is not the cause of this problem, you should definly test your levels.
I did see some test kits at redcoral for a fair price.
Basicly if your going to dose you must test, this goes for potasium as much as it does for anything else you add to your reef.

[blueyota]

Your DKH is really high for dosing vodka imo try to keep it more around 7 dkh
...maybe try lowering it a bit and see if that helps

[Coleus]

The dying rate has been slowed down after i stop dosing vodka. My system is high nutrient that is why i was trying to dosing vodka to bring the level down. I think probably i dosed too fast at once instead let it drip.

HEre is how it dies

[Carmen]

Mine did the same thing when I dosed coral snow.

[mark]

re: your pH, say probe calibrated but think broken. Does the probe calibrate ok?

I never had luck with the test kits, but will trust my calibrated probe.