I use the close up ( flower on the dail ) for close ups and put the camera right on the glass to stablize it. And for full tank shots I still have not figured best way to do them. Just a shot in the dark, you could say
After you load them into your computor you should be able to resize them in your photo program. I have adobi photoshop 7. look for " image " on top and click and should be an option to resize. Some programs are crap and you loose alot of quality so I hope you have a good one.