need some help with a leak

[fmelindy]

haha.... as the title suggests, I've got a bit of a problem with a leak and could use some advice. What happened is that a bit of sand got down between the aquarium and the rubber seal of the bulkhead while I was adjusting the plumbing and now it won't achieve a tight seal. Of course, this leaves me with a steady trickle from around the bulkhead which fortunately to this point I have been able to direct into my sump but I obviously can't just let it stay that way.

I can't be the only person this has ever happened to, I figure, so what can I do about it? Anyway of fixing it short of draining the tank? OH, BTW, It's a 94 gallon cube tank and it's just newly setup and is cycling with a small amount of LR in it right now, so no danger to livestock.