I went through pretty much the same thing several years ago.
Called Marineland and they said it would transfer.
I bought a tank that had never been used (stickers and plastic wrap still intact), had the receipt and took pictures with date stamp of the entire build to prove when it was set up.
Four months later tank cracked and they did not honor warranty since I was not original buyer.
When I pressed the issue with Marineland I was told I was
!