Has anybody out there modified the 2 media trays in their Emperor 400? The mod entails adding a airline and small bubble wand on the inside bottom of the tray, filling the tray with Bio Media, and a sponge pre-filter at the intake. Pretty easy. I modified mine in about 1 hour. The link for the mod is below.
Emperor 400 - Power Filter Tricks
If anyone is interested, I documented the whole mod with nice pics. It is a great way to turn a good filter into a great one.