Please help!!!!! Alkalinity too high. What to do?!

JuliaRuss

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Hello, saltwater chemistry gurus:

I am having trouble with super high alkalinity:

-my water source: 4.5 dKH
-freshly made batch of saltwater, using instant ocean (regular): 13 dKH (already too high)

current problem: alkalinity too high. Can’t hold pH steady (keeps going lower). Calcium and magnesium keeps dropping.

Equipment: Fluval Evo 13.5 G. Cycled since January. Corals only.

salinity: 1.025
Temp: 76F
PH: 8.0 (I just added some baking soda)
NH3: 0
NO2: 0
NO3: 0
PO4: 0.25
Mg: 1020 (I just added some Mg supplement)
Ca: 325 (I just added some Ca supplement)
Kh: 15 (!!!!!!!!!!!)

My eventual goal is to add two clownfish, an anemone, and a small CUC.

Any insights will be super appreciated!!!! Thank you!
 
Reef Chasers Aquaculture

arking_mark

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Most problems can be mitigated with larger water changes and GAC

I recommend you do some large water changes with fresh ASW.
 
Zoanthids

dedragon

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are you using an adequate amount of aragonite sand in the tank or live rock? that usually helps with ph swings for me. If pH is dipping opening a window and also directing flow towards surface to help surface water agitation can help with o2 and ph problems.
 

Randy Holmes-Farley

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are you using an adequate amount of aragonite sand in the tank or live rock? that usually helps with ph swings for me. If pH is dipping opening a window and also directing flow towards surface to help surface water agitation can help with o2 and ph problems.

I do not think the aragonite is helping with pH swings, unless you are talking about well down into the 7's. It does not dissolve at any pH above 7.8 in seawater.
 

Randy Holmes-Farley

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-my water source: 4.5 dKH

As folks noted, that may be the issue.

What is that water?

You add it to make new salt water and for top off?

There is 0 alkalinity in pure water.
 
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