[Aquattro]

OK, so here is what I think the problem is...

I measured the pH at the input of the sump before lights on and found 7.8. Pretty low..So I think that the last chamber of my sump, where my reactor discharges, has an even lower pH (had to get to work so haven't measured it yet)of say 7.6 or 7.7. This water is being returned to the tank via two outputs pointing from the rear center of the tank to the front corners (right where the clam is). I also notice now that the opposite front corner has some whitening of corraline as well. This coincides with me stopping the use of limewater, as the reactor is now meeting all requirements for Ca and alk.
Without the kalk upping the pH, the output stream from the return pump had a low pH flow that directly hits the afflicted areas.
My idea to fix this is move the reactor output into a tube that will be placed directly over the pump input for my skimmer. Hopefully this agitation will expel some/all of the CO2 that the reactor puts in.
If this doesn't work, I'll have to consider a refugium full of algae on a reverse light cycle(I don't really have room for this though).

Thoughts??