Just a suggestion; if I were you, I'd worry a lot less about how things look and a lot more about just enjoying the little things in life, even if some of those little things make you feel tacky. Which, by the way, in no way is a well loved fish tank a tacky object to have in your home. I don't own any myself, but I think they are beautiful.
I do what I want with my home and money and find it odd that some people don't. I don't live my life to impress others. I have raised snakes, iguanas, turtles, frogs and even a tarantula. And the huge handmade wooden cages I made for my iguanas must have looked unsightly as hell to some people. But these things made me happy! Had anybody dared come into my home and suggest I was tacky because of my hobby, I would have personally shown that person to the door, laughed at their snobbiness, and encouraged that they take the stick out of their rump before giving them the final shove off my property. Life is way too short to not engage in any hobby or interest that makes you happy and especially, life is too short to worry about appearances. But that is just an opinion.