Got my 6 from nanotuners this afternoon. I thought it passed the first leak test so I went to the lfs who was pretty excited to help me and picked up my first batch of live rock, sand, and water from their established system. I got it home and in the cube, and after watching it for 20 minutes there was a small persistant leak. About 1/2 cup an hour.
Everythings in a new 10g at the moment. Not sure what I'm going to do.
Actually the positively first thing I'll do is contact nanotuners and find out what they think.