and erik: no it was a 75 gallon, she is a Caribbean reef octo
i just had a glass canopy and closed the back with plastic (i cut spaces for protein skimmer, filter and cords) then i taped the back plastic down with duct tape

YES she loved to play with bio balls!! lol
and yeah the shell is great since it gives her COMPLET privacy whenever she wants, (when they feel the can hide somewhere good really fast they'll feel ok about swimming around more) (because they feel they can get away fast) [: