Need advice on low alk

[Jamesrup0411]

25 gallon frag tank, 40 gallon sump
Just did 5 gallon water change Friday. Tested today
Nitrate 0
Phos 0
Cal 440
Mag 1460
Alk 5.8
Salinity 1.025

Tank is stocked with snails and crab for cuc. One clown , two chromis.
I have mostly zoas(45)and a couple torches(3) and one cheap acro just to see if I can grow without dosing. Using reef crystals for salt, are my coral really consuming that much in two days?

 

[jurgenph]

what salt mix? and what test kit(s)?

J.

 

[Travis Stewart]

25 gallon frag tank, 40 gallon sump
Just did 5 gallon water change Friday. Tested today
Nitrate 0
Phos 0
Cal 440
Mag 1460
Alk 5.8
Salinity 1.025

Tank is stocked with snails and crab for cuc. One clown , two chromis.
I have mostly zoas(45)and a couple torches(3) and one cheap acro just to see if I can grow without dosing. Using reef crystals for salt, are my coral really consuming that much in two days?

remember that your high alk in water change will only bring it up a fraction due to water change volume compared to tank volume. How much water are you changing?

 

[Jamesrup0411]

remember that your high alk in water change will only bring it up a fraction due to water change volume compared to tank volume. How much water are you changing?

5 gallon bucket so just a bit over 10%

 

[Jamesrup0411]

im Running gfo in reactor if not my phos goes up and a skimmer. I have live rock and chaeto in sump. Other than that no corraline growth and it’s bare bottom.

 

[Jamesrup0411]

what salt mix? and what test kit(s)?

J.

Reef crystals and Hanna for phos and alk
Red Sea for mag and nitrate
Salifert for cal