Confused on ALK

[Fishbro]

So I’ve been testing my tank for the past week (on day 6 now) to see what my Alk consumption is. I have 11 frags in my tank and coralline algae is starting to grow. Tank is 2 1/2 months old and it is a Biocube 32. The frags are almost all softies except a couple LPS. My Alk is as follows:
April 7th: 9.8
April 8th: 9.3
April 9th: 8.9
April 10th: 8.6
April 11th: 8.4
April 12th: 8.3
April 13th: 8.3
This doesn’t make much sense to me my Alk seems to be just staying steady at 8.3 now? I like my Alk to be 10 so I know for sure my corals are using it up too.

 

[madweazl]

See what it's like in a couple more days. The corals you have aren't large consumers (especially when small).

 

[Sean Duggan]

I wouldn’t test once a day but once every week to get your overall consumption. That would be a little easier to determine how much all your tank is taking up and then dose accordingly. Also the all not changing might be due to your testing kit. The testing kits most people have are only hobby grade.