Corals consume 1dkh a day...soda ash.

Miami Reef

Valuable Member
View Badges
Joined
Sep 8, 2017
Messages
2,206
Reaction score
1,540
Review score
+0 /0 /-0
Location
Miami
Hello. My tank consumes 1dkh a day, and I dose soda ash manually once a day starting.

Am I doing alright? I know you aren't supposed to dose soda ash for large adjustments, but every day is a large adjustment. I think my PH rises to 8.4 max after dosing, but those API tests aren't the greatest.

I dose much less calcium than I do Alkalinity. Apparently it'd supposed to go at the same rate, but it's not.

Should I switch to sodium bicarbonate?
 
Click to watch best scape method in 5 easy steps!

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
45,405
Reaction score
34,453
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
That is a pretty high alk target, but is fine if you elected it for faster hard coral growth. Be sure to maintain adequately high nutrients to avoid issues.

You are not really seeing unbalanced demand. At 1 dKH alk drop per day, calcium will only drop about 6.7 ppm per day, so your measurement of 5 ppm per day is as close as you can expect to be with a hobby kit.

It's ok to dose less than equal parts, but I personally would stick to equal parts (assuming it is designed for equal parts) until calcium got too high because calcium testing is not good enough for constant jiggering of doses.

What two part are you using? Not all are properly designed for 1:1 dosing, even when they claim to be.
 
OP
Miami Reef

Miami Reef

Valuable Member
View Badges
Joined
Sep 8, 2017
Messages
2,206
Reaction score
1,540
Review score
+0 /0 /-0
Location
Miami
@Randy Holmes-Farley
These are the exact products I’m using.

According to the calculator, I need 210 ml of dissolved soda ash and 143ml of dissolved calcium chloride daily. I inputted that my alk is 10 and I wanted it at 11 and for calcium I put 460 and goal is 465

BD4843C8-ED20-4C92-87E9-B19008F01762.png DDA43222-E82B-49F5-942C-50873C5416BE.png
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
45,405
Reaction score
34,453
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
OK, so assuming you make a two part from them as my DIY directs (BRS uses my recipe), then it is appropriate to use 1:1 dosing unless you need to make substantial correction (up or down) to calcium.
 
Top Shelf Aquatics

blasterman

Valuable Member
View Badges
Joined
Feb 14, 2019
Messages
1,730
Reaction score
1,923
Review score
+0 /0 /-0
Personally I would drop your alk target to around 10 or so but its a personal preference.

I've rarely owned an SPS tank that consumes alk and calcium equally. It requires a lot of SPS to do this. Unfortunately market brain washing convinces people something is wrong if your alk consumption isn't just like a 1000 gallon 10 year old Acropora dominant tank. Its BS.

Moderate pH increases from soda ash or kalk dosing doesn't bother coral. Its pH decreases that bother coral.

My dosing pump is not trustworthy and I manually dose alk every night. My main SPS tank chews up 2-3 dKH per day depending on pH and growth is nutz. I then spike it back every night. Its the average over 24hours that matters.

Obviously I'm losing some potential growth given alk has fallen so much during the light cycle. I concede that. However I'm not racing somebody for growth. I want healthy control and not relying on wonky gear made in China.

Last, I've owned reef tanks for 30+ years and not seen a lick of difference running calcium over 400.
 
Last edited:
OP
Miami Reef

Miami Reef

Valuable Member
View Badges
Joined
Sep 8, 2017
Messages
2,206
Reaction score
1,540
Review score
+0 /0 /-0
Location
Miami
OK, so assuming you make a two part from them as my DIY directs (BRS uses my recipe), then it is appropriate to use 1:1 dosing unless you need to make substantial correction (up or down) to calcium.
How do I know which amount to use? Because calculator says more of alk than cal.

Yes. I use your recipe
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
45,405
Reaction score
34,453
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
How do I know which amount to use? Because calculator says more of alk than cal.

Yes. I use your recipe

Always dose a two part based on alk demand, and only slowly adjust the calcium up ir down over time as repeated tests indicate a better calcium value is needed.

That said, in your case, the doses are nearly identical for 1 dKH and 5 ppm calcium, so it really doesn't matter.
 

blasterman

Valuable Member
View Badges
Joined
Feb 14, 2019
Messages
1,730
Reaction score
1,923
Review score
+0 /0 /-0
What Randy said × 10^7

Its nice to have calcium dialed in perfectly for daily dosing, but its not life or death. Alk on the other hand needs to ideally be kept at a daily average. Alk just moves so fast in a healthy tank one or two days not being on it and its off by a lot.

I test calcium once a week and dose once a week to get back to 450. A lot more accurate that way than trying to split hairs daily when coral isn't going to care anyways as long as calcium > 400.
 
BRS

When is the last time you purchased cleanup crew critters?

  • Past few days

    Votes: 57 11.7%
  • Past few weeks

    Votes: 133 27.3%
  • Past few months

    Votes: 158 32.4%
  • Over a half a year

    Votes: 70 14.3%
  • Over a year ago

    Votes: 66 13.5%
  • Other (please explain)

    Votes: 4 0.8%
Fritz
Top