Odd Filter Idea

Hi All,

I was wondering if anyone had ever hooked up an overhanging powerfilter
to an undergravel filter? I notice that after I have my tank set up for
a while, lots of mulm accumulates under the UGF's bed. (Again, this is
expected and wanted). So every other water change I do, I pull out one
of the extra cap, put the syphon over the hole and suck out as much of
the crap (no pun intended) as I can remove. This works well enough that
I don't mind doing it.

All that being said, I noticed that my Aquaclear 500 is almost exactly
above on of the UGF's tube opening which made me think. Would it be a
good idea to link them. The positives I see is that it would remove
much mulm from the bottom and since it's constant, it won't have time to
build up. The downsides I see are that I have to change the filters
more often this way.

Does anyone see any other negative or positives about this? And/or has
anyone done this before?

TIA
-Ben