Things like this make me wonder if tank makers and equipment manufacturers know each other exist?
I wouldn't like to try it myself,but since you are desperate,can you chip away at the glass with a small pair of pliers until you have a big enough gap for the piping?
Good god do tank makers know that equipment has to go in tanks?? Short of pulling the whole thing apart I don't know what to suggest,I'm usually good at coming up with fixes when I need to,but thats totally stumped me.sorry
My dad managed to chip a bit of the glass off to make it so the pipe would fit, I then put the end bits on while the pipes were in the water, so its all set up now
I would run the 2 to be absolutely sure the new one is working properly,I had a huge stock loss once because a new filter was under-performing and I didnt realise right away.