Something that I did to get reed of dead spots was a med size maxi jet in the corner bottom of the tank to kick water behind the rocks. This has helped out a lot with not having any build up of debris in the corners. It is also set on the timer for the lights, so that at night there is little water current for the fish to sleep.

Here is the picture of it. You can only see the cord from the front and see the pump from the side. Its the one on the bottom not the 1200 on the top.


hope that this helps