Ok, Stupid question....do I attach an airpump to the airstone? :mrgreen: I have one from my freshwater days thath I could plug in. And when you say "normal gas exchange", you mean from just water movement? I"ve got an awesome ripple on the surface from the 2 k4's I have running, plus the 2 intake pipes are aimed towards each bottom corner of the tank, making a nice circular exchange.
I think a water change would help. I made a batch of fresh saltwater just now, I tested the PH and it's at 8.4 (I use Tropic Marin). So I'll do a 10% water change, and hope to make a slight raise in the ph. I"ve got it warming up now with a powerhead, so hopefully it'll be ready in a couple of hours.