Thanks for that advice Paul, it's a rubbish loose fit on that outlet pipe anyway and would always be falling in!
It's a 4ft fluval Vicenza 260 bow front with the fluval 305 canister filter! Got it for an absolute steal as they are discontinuing that range. Just needed some tlc!
We are going to be building up LR
behind that shipwreck, hopefully this Sunday we will be filling up with RO