Raise Alkalinity

[bckane]

My Calcium was low so I did a 25% water change yeasterday, also My Alkalinity was low 2.2 mg/l.
Today I did a water test and my calcium's up to 400mg/l, and my Alkalinity is still low.........It should be around 2.5-3.5 mg/l correct.?

What else should I do.?
PS My pH is @ 8.2

 

[reefrunner69]

A balanced ALK with a CA of 400ppm is 2.0 meq/L

If it is lower than that, or you would like a slightly elevated ALK, you will need to add an ALK buffer.