Sorry I took so long to reply. Had some problems with my internet connection!!
Over the last few days, I've inspected the lid, and I cant see any way of it fitting. Do you guys think it could fit? (The AquaClear HOB filter)
http://i225.photobucket.com/albums/d...4072008038.jpg - Inside of lid
http://i225.photobucket.com/albums/d...4072008039.jpg - top of lid/tank
http://i225.photobucket.com/albums/d...4072008040.jpg - tank with lid open
Thanks again.