Thanks for all the responses guys! I had heard the rumor about the guy using the Kubota one as well but I never found any specifics, so thanks for that! Since I actually have two tanks with the same problem I may try two different approaches, see which one works better, and post the results. Im thinking a transparent epoxy on one and full transplant/replacement on another.
Churioz, I watch your youtube videos! they were part of my inspiration to buy these projects!