I'm pretty bored today and no plans, so I figured that I'll try and make a 10 gallon verticle tank. I'm going to be making mine as close as I can to Ben Green's ( http://thechocohut.homestead.com/DIY_20gal_Vert.html ) design, as I like it the best. I've got plenty of 10 gallons. Just need to make a Lowe's run for some plexi, parts for the vent, silicone, latches, great stuff, etc. My main question is about the Great Stuff. I asked my Dad about this since he's a carpenter/handy man and he said that's it's pretty powerful and may crack the glass if wedged in a corner. Has anyone ever had this happen? What techniques do you use to prevent this? Maybe put the great stuff 2" away form corners and let it expand out to them? Any and all comments appreciated.