personally, i would make three boards ( front and 2 sides ) out of a suitable wood that matches the furniture, fix standard DIY magnets onto them and mount em..That way, each panel can be removed independantly, with ease and so cheap to do and i think it would just finish the tank off nicely..How-ever, i do know that you like to have your fuge open for the eyes to see..But, once the panels are made, its your choice then..have the front on or off..
Just an idea
Niko