I'm aerating right now, and the pump will be here tomorrow. I've only fed three times, thinking that the less nutrients I add to the water the better right now. I also went ahead and added the fish because of the comparatively cooler water temperatures equating to slower breakdown of fish waste. As far as ammonia and nitrite readings go, I ordered a test kit from API that should test ph, nitrates, and nitrates. To clarify about the system, I set up a 330 gallon tank to hold the fish and used one 55 gallon barrel as a sump tank, and am sawing 3 barrels in half lengthwise to serve as growbeds. These beds will be filled with driveway gravel (drainage rock) to serve as the growing media. I'll be sure to post pictures tomorrow to illustrate the setup!