Dan gave me the "vegetable oil" advice quite a while ago <keep your jokes to yourselves ;)> and it worked like a charm.
Considering it's made of vegetables and edible, I quickly got over my concern about trace amounts entering my tank.
Anyone remember the "Real Names" thread Greg Scheimer started in GRD? If not, it can be summarized by saying it was six pages long, ending up being locked, and featured appearances by "Albert Thiel" among others. You can judge which side I was on by my user name.
I was "in the business" for...
Be generous when making your hole, if that's all that's that keeping your entire tank from draining into your sump. Algae growth, a piece of nori, a snail, etc... can plug it just enough to cause it to fail when you actually need it months down the road. I would also test it regularly for this...
I personally find this fascinating... Here are some of Nathan's previous threads on the subject (I hope you don't mind, Nathan):
http://reefs.org/phpBB2/search.php?mode=results
Please keep us updated.
Hey! My Power Sweep ran for 12 hours before seizing up forever. It was the happiest 720 minutes in my fishes' lives ever. You think theses things might last 13?