Originally Posted by
drainbamage
this sucks man! 1 option I could throw your way for a possible fix for cheap $$. couple of 30 gallon trash cans (or whatever you have around, if you're an apartment dweller, they're not too pricey at depot) with brand new trash bags (they're clean and safe for use this way.) Fill them up with EVERYTHING (gravel, water, decorations, fish, etc.) Use the filters from your tank on the cans, now that tank is empy, see if you can spot leak. Reseal, give 36 hours to dry, and then refill with tap. If seal holds, set back up. If the tank hasn't completely emptied over last few days, it's probably a pretty tiny leak.
All I could think of, hope you find a solution!