Thanks for the reply Tom! With regards to the CO2, I adjusted the rate of CO2 by cranking it up until the fish are gasping and then backing down a notch. So I assumed my CO2 level is fine, but maybe I'm wrong. I've got a bunch of Windelov in the tank as well, which is not going black, but its not growing that quickly either. I always thought 3 bubbles per second on an Aquamedic 1000 reactor would provide plenty of CO2 for a 30 gallon aquarium, since it was designed for much larger tanks. Have you had any experience with the same reactor?

I've got a spray bar which I've positioned to cause a slight ripple on the surface and good movement across the tank. Maybe I should position it to cause less ripples?