There was no aquarium-where it is depicted in the film, there actually was a large, carved oak sideboard.
Three or four years ago, I did a four-part series on the Romanovs in Film, and this was one of the movies I researched extensively. It's no accident that the cover only has 3 daughters. For those of you who have seen the film, remember the sub-plot about the woman whose daughter goes missing at around the time of the murders? She goes to Yurovsky and asks if he knows anything, and Yurovsky later confronts Ermakov about the missing girl. This was (like the cover) injected into the plot deliberately, as a parallel to the issue of Anastasia, and the backstory of the missing young girl is meant to subtly suggest the possible escape of the youngest Imperial daughter. Watch it again, and you'll see what he is implying.
Greg King