Lord only knows I love to avoid work and all the hassles that come with jobs like this. So in those events where I moved tanks, furniture, etc. I found one really simple method. It does take two people. In this case probably 3. One to simply lift one end of the object, and another to slide an over-sized section of carpeting under just one end, upside-down. Then one person pulls on the rug and another lifts ever so slightly while pushing. I've moved pianos over hardwood floors this way without a scratch, and moved fish tanks with barely a wave. Patience is key with moving tanks. I gotta admit, I really like the steel rod idea and it makes a ton of sense on a concrete slab.
Fish tanks are an entirely different beast; glass or acrylic. There's been lots of advice and cautions provided here, all very well-founded. To me the one that's the true deal-breaker is the issue of the tank going through another cycle. With all the fish in there that you've described and substrate, I wouldn't go the "all-in" route. If you have a LFS nearby that will work with you, they may be willing to hold the fish for you until you get it moved and re-cycled. A bare-bottom reef tank would be a candidate, but not your case. This piece of advice comes from a person that's always looking to do things with as little effort and fewest headaches as possible.