like adding a fizz cup with an airstone and the ca effluent or feeding the calc reactor effluent directly into your skimmer

Yes, if I crank up the bubbles of CO2 or the effluent flow rate it drops my PH even more. However, the "fizz cup" you mentioned. I ahve heard rumors of this, but cannot find any real info of it. How do you set this up. Are you dumping the effluent into a cup with an airstone going, thus raising the PH on the effluent before it goes into the sump? Same idea of putting it into the skimmer?

I have not tried this yet, How large a cup do I need, or how much residency time? Perhaps throwing it in the skimmer would be good, I have a rather lage one to work with.

Also, just picked up some fiberglass screen at lunch. Will make some covers for the tank of this. I can then turn on the fans in the hood and should get some added evaporation this way due to the open tank, fans, and heat from the lights.