I am planning to add a sump to my 55 gal tank. My main reason is to move protien skimmer and other stuff out of tank. Any problems using 2 ten gal glass tanks? I was thinking of drilling 1 1/2 inch hole and using bulkheads to plumb them together. Reason i am thinking about using 10 gal is they are cheep 10 bucks or so, and they will fit under my stand. If you know of problems with this idea please let me know and save me from myself.