As aldiaz33 suggested, too much flow through the 1000 is not good. Not due to biological reason but due to mechanical as you are experiencing. The media is designed to do both. High flow will only push the particulates back into the tank. A 2000 will allow you to trap more but it will only buy you a few days before it does the same. Trud-tles will require more mechanical than fish tanks in my opinion. Since you already have a big pump, have you considered a separate mechanical filter? In your case, I believe high flow is required to keep the tank free of excessive debris.
Ken,
Yep. I'm slowly coming to the conclusion that more mechanical filtration is needed in my set up. I was hoping to avoid adding more equipment (due to lack of space, obviously cost, and not wanting to tear stuff apart), but looks like an upgrade is in my future.
