The diver is the same length as a single coil cart, roughly 40mm I think, it sounds like your
tank uses XL length cartos. Im not familiar with the tank your using, so I don't know if there is a shorter tube available for it. A good cheap tank option is the AGR, it comes with both lengths of tube and a fill hole. I never had much luck with it. IB
tanks makes a great tank for not much dough, it uses a Pyrex glass tube, no worries about
juice cracking it. You can order it in standard and XL length. The thing to consider about a Diver is they have a flange at their base and so won't sit flush on most mods. Atmistique, the makers of the Diver also have a Diver specific tank called the "Scuba tank". Rely sweat looking tank. It has a bottom fill hole big enough to through a cat threw, really convenient.