So the OP isn't here anymore, but I present evidence exhibits 1 and 2 that is can be done and look pretty nifty:
Diver Dan:
Spaceman Steve and Moonman Murph:
If you wanna do a lego tank it's pretty simple. Diver Dan is attached with superfine fishing line to a plastic plant anchor buried under the gravel in my 10g. Spaceman Steve is tied off to the rock under the rock Moonman Murph's bugggy is tied to.
Lego land had some Lego "Atlantis" sets in a tank in Dallas, it was a small diver & a sea diving vessel. I will try to post a pic.
Thought is was a cool idea & my 7yr old loved it!
you mean this tank? completely made of legos, then painted to match the mario 1 theme. i love it!!!! not my tank, but it is a 55 gal with the exact stand i have. hmmmmmm....... time for me to hit up garage sales for oodles of legos?? lol.