Thanks for the input. I did however forget about my biofiltration above. I have a 250 gallon tank half full of bio balls, and the rest is filled with plastic pieces which have generous amounts of surface area. Now that I think about it, the temperature in the tanks has gone up since I've turned the heaters back on. Which would limit oxygen levels to some extent. As for the pool pump, it gravity feeds over the 100 micron screen which catches solids, then goes into the pump, through the house filter and into the bio. I've had the water going into the pump before the screen in the past, and all that does is break apart solids and makes for terrible filter there on.
