Algae scrubber effects on Alkalinity

[snakeblitz33]

Alright, as you all know I really like the use of algae scrubbers as a way to decrease/eliminate Nitrate and phosphate from a system and help remove heavy metals and other contaminates. So, as you know, by growing algae, you have to have adequate levels of fertilizer (nitrate and phosphate) some source of iron and trace elements (kents essentials or other) and plenty of Carbon Dioxide.
Nitrate and phosphate are generally not a problem to supply for many aquarists, neither is providing an iron source. Carbon Dioxide is something that your tank acquires through respiration from fish, corals, and other living organisms. In general, a saltwater tank has a problem maintaining adequate oxygen levels. With an algae scrubber, it's the opposite.
Right now I'm running into a problem with a couple of tanks that run algae scrubber. Since the algae is super saturating the water with oxygen because it's using Carbon Dioxide, it's using CO2 too quickly and turning to alkalinity in order to grow. At least, that is my theory, and from what I have read on a couple other forums.
Calcium and alkalinity and magnesium all have to be balanced in a healthy tank. I ran a few tests on the tank and here are the parameters:
Nitrate: 0
Phosphate: 0
pH: 8.2
Calcium: 400ppm
Alkalinity: 7dKh
Calcium and alkalinity are not completely out of whack. I think that once there are more fish in the tank and some corals, more CO2 will be released in the water column. Would the easiest thing to do is to increase alkalinity by 1dKh and then use a kalkwasser drip for a few days to get calcium and alkalinity back up and keep using it to keep the levels up? Am I just imagining things? What's the way around this? Thoughts? Opinions?

 

[btldreef]

Is this a fallow tank right now, or just lightly stocked?
I know when I run my skimmer wetter, my alk and ca drop, but I have a ca reactor, so it's an easy fix. I guess that's the same as doing the kalk drip if you really think about it. Both ways are still introducing more alk and ca to try to bump numbers and balance the system.

 

[snakeblitz33]

It's really lightly stocked for a 110g. Going to add more fish as necessary.
I don't know why ca and alk have dropped so much, other then maybe doing one 20% water change with regular instant ocean salt. I guess I'll put it on a kalkwasser drip for a few days and see if it brings it up any.
At this point, I'm doubting that it's making that much of a difference in alk.

 

[2quills]

What's your lighting schedule like on this scrubber? Maybe you can back on it to about half the time for a little bit.

 

[snakeblitz33]

16 hours on 8 hours off. Standard time. It's on an opposite lighting schedule as the display tank.
Right now I'm doubting that the scrubber is having any effect on alkalinity. I'm going to dose kalkwasseron this weekend.