It's down. 1/4" was a "worst-case" estimate, like when someone ran by. It was more like 1/16-1/8" when walked by. Made me very nervous... It was a 30 gallon on one of those wrought iron stands. I think the movement was largely due to the severe lack of lateral support from the stand. The 55 in the living room (same scenario, different room) doesn't move at all and it's on a diy wood stand. The tank had to come down anyway, but when it goes back up it will for sure be on wood! Thanx for the replies.
30 Gallon FW. 1 Albino Bushynose Plecostomus, 2 Harlequin Raspboras, and 1 Male German Blue Ram