iluvfish
You might want to try building your own fuge out of plexi and then you can drill it. Its actually pretty easy. I just started the process and have been practicing.
TOTAL COST $52.89
Plexi sheet from Home Depot (they cut it to size) $29.90
Weld-On #3 w/applicator $18.00
PVC tubing $4.99
There are a TON of how to do's for using Weld-On with Plexi. (not all in SWF message board) Ive done some testing with some scrap pieces today and its really easy.
The $52.89 isn't cheap but you can have a Fuge that you won't have to worry about overfilling onto you floor, and you can customize it to fit perfect under your tank.
The peace of mind you will have is well worth the $52.89
If you want, I can email you a link to a very informative site about building an Plexi tank.
I compare Weld-On to JB-Weld. Very easy to use. It actually melts part of the plastic to create a seamless tank! Just like the pros...well sort of