Parameters .

[Rmckoy]

A little confused when it comes to corals consuming alk , cal .
Upgraded to a 230 gal . Added old rocks plus more from old 90 gal .
added a fair bit of frags .
mostly sps , a few lps
I have been testing every evening since water change and getting the same numbers up until this evening .
Thursday evening was water change .
tested after water change
Sg 1.026
Alk 7:5
Cal 420

Friday and Saturday test results were the exact same
1.025 sg
7.5 alk
425 cal

I tested this evening and
Sg 1.024 ( ato filled sump after dripping new frags )
Cal 425
Alk 7.7

with the amount of corals in this tank I would assume it would consume something and need to dose

is this normal to not need to dose ?
is there something missing ?

 

[PBar]

Hello,
I had a similar behaviour when I moved all my sps to another tank.
I’m not sure if it is your case as well, but I cut all corals to new base... so my guess, by that time, was that the corals entered into a kind of ‘survival mode” or “hibernate mode”... for a few weeks.
But indeed, it was extremely minimal initial consumption, like almost nothing.
Let‘s see if there is any other similar reports.

 

[Randy Holmes-Farley]

If the corals are not growing for any reason, you won't see alkalinity decline.

Calcium declines are hard to see anyway, unless you monitor for a more extended period.

Also, there are other ways that alk may be boosted, such as declining nitrate, tap water for top off, slowly dissolving sand, etc.