I've never heard the part about them busting seams. I live here in Austin where Roger directly imports all of the Tunze equipment that is redistributed for sale around the US. Aquatek has been using them for quite sometime without any troubles.

Do you have any links to read about broken tank? I'd like a look at them as my girl has already told me my Xmas prezzie is a Tunze Wavebox for my 75g. If true I'd think a 4'er would bust before a 6'er, a 7'er etc... That would be very important to me with a smaller tank.