I'm jealous you have a sump/fish room. Mine has to be free standing.
I have a 3/4" Uniseal kicking around. I can put a plug in it that's super easy to remove. Now with this mod (thanks greg...good thinkin!!) I can remove a little over 10 more gallons from the system, so I could do about a 19 gallon water change without sucking on any hoses (yeck).
The black circle represents the Uniseal.
