where to put the 'fuge.....

[hqgc]

As in my previous post we have established that I am going to incorporate a refugium into my sump.
Because my sump isn't the best configuration for 'fuge placement I was looking for some input.I know that I will have to put it in the last chamber but the only problem is that is where my return pumps are as well. I am concerned about the sand ( or mud) getting into the pumps.
I was contemplating making the 'fuge in a rectangular plastic container and then put that in the sump to contain the sand.
Does this sound like a reality?
Here is the pic again of the sump that is "similar" to mine.
(Sorry my digi is on the fritz...)
Attachment 667