High Alk Problem

[straightrazorguy]

So, yesterday on my lunch break I went home and noticed a bunch of air in my Alk. dosing line. So I manually overrode the controller and ran the dosing pump to take all the air out. Phone rang, then other things happened and I ended up leaving the pump on for 5 hours. Tested alk when I got home (6 PM) and it was almost 11 (I normally run the tank around 8.0).

This has happened to me once before, and a bunch of SPS receded from the bottom up. I feel like an idiot who doesn't learn, ever!....

What can I do? I tried changing some water, but I didn't have a lot made up and it didn't even put a dent in the alk. I would hate to see my SPS recede again...

Some stats: Mixed SPS and LPS tank. 150 gal cube, 40 Gal sump, and 55 gallon refugium all plumbed in. Typical params: Ca 410-420, Alk 7.8-8.4, Temp 78, Phosphates 0.02-0.06, nitrates undetectable. I run GFO and biopellets. Photon 32 Reefbreeder/Evergrow lights. Reefkeeper Elite controller.