Dosing 100ml/day of alk and no calcium at all. Is this normal?

cimulation

Community Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 26, 2020
Messages
36
Reaction score
6
Review score
+0 /0 /-0
I have 220g of total water in my system and it's a little over a year old. I have about 15 sps frags and coralline completely covers the rocks. My 3 main readings are Ca:459ppm - Alk:7.7dKH - Mag:1425pm. I only dose 100ml alkalinity at this point because my calcium never changes. Is this normal that I'm dosing this much alk and calcium is unchanged? Should I dose more alk to increase it? What is ideal if I plan to maintain it SPS dominant?
 
Fritz

DC Reefer

Well-Known Member
Review score
+0 /0 /-0
View Badges
Joined
Oct 2, 2020
Messages
611
Reaction score
778
Review score
+0 /0 /-0
Location
Boulder
Alk will move much faster than CA. If you are doing water changes I would expect your CA in the fresh SW is a little higher than 459 and the water changes are taking care of the CA consumption. As your tank matures and corals grow you will likely end up dosing CA (or your CA test is wrong:) )
 

Randy Holmes-Farley

Reef Chemist
Review score
+0 /0 /-0
View Badges
Joined
Sep 5, 2014
Messages
45,744
Reaction score
34,984
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
100 ml of "alkalinity" can mean anything. What product?

How long have you been dosing that amount and no calcium?

If it is my DIY recipe (as BRS sells), then you are only adding 0.65 dKH per day, and the expected matching calcium demand is about 4.4 ppm per day. It may take a while to detect that change, especially if doing water changes with a high calcium mix.

Declining nitrate will also consume alk and not calcium.
 
OP
C

cimulation

Community Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 26, 2020
Messages
36
Reaction score
6
Review score
+0 /0 /-0
100 ml of "alkalinity" can mean anything. What product?

How long have you been dosing that amount and no calcium?

If it is my DIY recipe (as BRS sells), then you are only adding 0.65 dKH per day, and the expected matching calcium demand is about 4.4 ppm per day. It may take a while to detect that change, especially if doing water changes with a high calcium mix.

Declining nitrate will also consume alk and not calcium.
Yes, it's the BRS soda ash. Mix one pouch per gallon of water. I've been dosing strictly alk for at least 8mos now without calcium declining much at all. 20% water changes once a month with reef crystals. I don't have an algae problem at all. Not sure if I'm on the right track.
 

Randy Holmes-Farley

Reef Chemist
Review score
+0 /0 /-0
View Badges
Joined
Sep 5, 2014
Messages
45,744
Reaction score
34,984
Review score
+0 /0 /-0
Location
Arlington, Massachusetts, United States
Yes, it's the BRS soda ash. Mix one pouch per gallon of water. I've been dosing strictly alk for at least 8mos now without calcium declining much at all. 20% water changes once a month with reef crystals. I don't have an algae problem at all. Not sure if I'm on the right track.

The water changes may be offsetting the small calcium demand.
 
Orphek OR3 reef aquarium LED lighting

arking_mark

Valuable Member
Review score
+0 /0 /-0
View Badges
Joined
Mar 2, 2016
Messages
1,736
Reaction score
1,136
Review score
+0 /0 /-0
Location
Potomac
You may want to think about:

Don't chase #s, chase stability. When altering the parameters of a reef tank, always do it in an appropriate way.

A good way to target stability is targeting your artifical salt water (ASW) #s. That way water changes don't impact your #s.

If you want higher parameters use high-parameter salt. If you want more natural levels there are salts for that to.

For other useful precepts...

 

IS RTN/STN MORE COMMON THAN IT USED TO BE?

  • Yes! I (and/or my friends) have experienced it more than it used happen.

    Votes: 56 21.7%
  • No. I think it's about the same.

    Votes: 84 32.6%
  • No. It's actually less common than it used to be.

    Votes: 26 10.1%
  • I've never experienced RTN/STN.

    Votes: 29 11.2%
  • What's RTN/STN?

    Votes: 63 24.4%
Chaos Aquaculture
Top