I am gonna go out on a limb here, but, I think this limb can hold the weight of what I am gonna say.
From reading the thread I take that your wife is not indifferent to your hobby and even actually helps with it.
If I were you, this is what I would do. I would dedicate that tank to your wife and then make it a dual build tank. Totally redo it as a tank that she can have the overriding decision on stocking, decor etc.. .
How long have you been married if I might ask?
Now to share a quip from my own hobby experience with my wife. There was a 50g tank that I bought that came with fish. The guy asked me if I had space to rehome 3 8 inch catfish. I said for sure. What I got was a nasty surprise. 3 iri sharks from 10-14 inches in length.
I kept upgrading the tank size that they were in as they would grow, though I had a real hatred for them because they are so skittish. I even had one of them jump a tank go about 3 feet in the air and land in my waterchange sink. My wife could hear me from the basement as I literally told the fish what I thought of it.
Yet, my wife told me she loved them and that they were her favorite fish. So they ended up in my 8 foot 300g. Eventually, I was able to place them at one of the local fish stores 1500g tank.
What I did do though is hunt down 3 10 inch columbian sharks and have them set up in my 180g folr tanks. I specifically got them and dedicated a 6ft tank for them so that my wife could have a species of fish that she loves in my collection. She said she really likes the body style and way they swim. I will eventually set up a shark pond as a suprise for her.
Personally, if the day ever comes that my hobby is more important than the only person in the world with a ring that matches mine I will take a hammer to each and every one of my tanks.
At the end of the day, I have come to appreciate the shark looking catfish and have my own quasi shark tank.