High pH, low kH... Huh?

TheoScapes

Community Member
Review score
+0 /0 /-0
View Badges
Joined
Jul 17, 2022
Messages
47
Reaction score
56
Review score
+0 /0 /-0
Location
Vung Tau, Vietnam
I'm hoping someone can give me some advice.

My pH is very high (between 8.5 and 9) while my kH is very low (5.7).

Are there any DIY remedies (soda ash etc) that would work here short term and anything I can dose long term?

Thanks,
T
 
www.dinkinsaquaticgardens.com

Rmckoy

5000 Club Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 24, 2013
Messages
6,264
Reaction score
7,671
Review score
+0 /0 /-0
Location
Ontario Canada
What’s your salinity and what salt are you using ?

as mentioned by randy . Ph that high is very unlikely . But before dosing to bring all up I would confirm the test with another and see if you get the same numbers .

if salinity is 1.025-1.026 Alk that low only means you would have tons of something consuming it .
 
Cyber Monday
OP
TheoScapes

TheoScapes

Community Member
Review score
+0 /0 /-0
View Badges
Joined
Jul 17, 2022
Messages
47
Reaction score
56
Review score
+0 /0 /-0
Location
Vung Tau, Vietnam
I used Red Sea blue bucket and recently (post low alkalinity numbers) switched over to Fauna Marin's Meersalz.

I've always kept my salinity at 1.026.

I tested the alkalinity of my salt mix at 1.026 before adding it to the tank with the same test kit I use on my tank and it read 8 dkh, so I'm pretty sure the Salifert is accurate.

But I've also only got LPS and softies in my tank so don't know what could be so hungry for all?
 

Rmckoy

5000 Club Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 24, 2013
Messages
6,264
Reaction score
7,671
Review score
+0 /0 /-0
Location
Ontario Canada
I used Red Sea blue bucket and recently (post low alkalinity numbers) switched over to Fauna Marin's Meersalz.

I've always kept my salinity at 1.026.

I tested the alkalinity of my salt mix at 1.026 before adding it to the tank with the same test kit I use on my tank and it read 8 dkh, so I'm pretty sure the Salifert is accurate.

But I've also only got LPS and softies in my tank so don't know what could be so hungry for all?
Coralline algae ?

if the Alk is that low , even adding new water with dkh 8 will not increase it unless you’re to do large water changes .

I’d dose 2 part once you are sure the test kit is accurate and get it up to your target .
 
OP
TheoScapes

TheoScapes

Community Member
Review score
+0 /0 /-0
View Badges
Joined
Jul 17, 2022
Messages
47
Reaction score
56
Review score
+0 /0 /-0
Location
Vung Tau, Vietnam
Thanks for the advice!

Only problem is I live in Vietnam and you don't get two-part here unfortunately. So I'm on the hunt for DIY remedies or alternatives.

My options are pretty much Red Sea Foundations, All for Reef, or Fauna Marin balling series.

Or doing Soda Ash in my ATO, but I'm hesitant because I haven't used it before and don't know how soda ash will further affect my pH.

No coralline algae yet (after 5 months) which is in itself worrying...
 
www.dinkinsaquaticgardens.com

Rmckoy

5000 Club Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 24, 2013
Messages
6,264
Reaction score
7,671
Review score
+0 /0 /-0
Location
Ontario Canada
Thanks for the advice!

Only problem is I live in Vietnam and you don't get two-part here unfortunately. So I'm on the hunt for DIY remedies or alternatives.

My options are pretty much Red Sea Foundations, All for Reef, or Fauna Marin balling series.

Or doing Soda Ash in my ATO, but I'm hesitant because I haven't used it before and don't know how soda ash will further affect my pH.

No coralline algae yet (after 5 months) which is in itself worrying...
Look through @Randy Holmes-Farley has a recipe for diy 2 part

Alk part is essentially baking soda mixed with rodi water

Dow flakes might be easy to find ( I can’t find them in Canada ) for the calcium part .

baking soda ( sodium bicarbonate ) or soda ash ( baked baking soda ) should be easy to find anywhere
 
Corals.com

Rmckoy

5000 Club Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 24, 2013
Messages
6,264
Reaction score
7,671
Review score
+0 /0 /-0
Location
Ontario Canada
I posted a calculator above that I find the easiest to use

knowing the volume of your system as close to accurate as possible is best .
For example I clicked on baking soda in the product list , and made up the Alk dkh to be 7.5 with desired level to be 8
 

Attachments

  • FF67AC4E-4EEB-4B74-BFEC-2DA69C1D8A5D.png
    FF67AC4E-4EEB-4B74-BFEC-2DA69C1D8A5D.png
    160.8 KB · Views: 9
Nutramar Foods

Randy Holmes-Farley

Reef Chemist
Review score
+0 /0 /-0
View Badges
Joined
Sep 5, 2014
Messages
54,697
Reaction score
47,503
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
Randy,
I just tested the pH with another test kit and it reads 8.4.

Can you recommend any additives that won't raise pH but raise dkh?

Baking soda/Sodium bicarbonate (and any products made from it), Salifert All in one (calcium acetate) and Tropic Marin All for Reef (calcium formate). :)
 
World Wide Corals

Does it matter to you whether your fish are captive-bred or wild caught?

  • I only buy captive bred fish.

    Votes: 95 14.4%
  • It matters, but I will buy either captive-bred or wild-caught.

    Votes: 462 70.2%
  • I think wild-caught fish are the better option.

    Votes: 16 2.4%
  • I don’t care where the fish were bred.

    Votes: 85 12.9%
Top