You could move your 45 man....I moved my 65 by myself half-full of water with 70lbs of wet sand in it. Definitely wasn't GOOD for me...my back hurt for a week. Just gotta brace yourself against the stand & tank and walk one corner bit by bit. Once you get it out of its carpet groove its a little easier My 20g I can move full of water without much issue at all.
I just really didn't wanna risk it to be honest haha, the weight isn't a problem just one over-exuberant movement and my room is flooded very quickly hahaha - fortunately my manager let me return it and i grabbed an ac110 so s'all good