Getting a turtle tank, question about smell

Hello, I would like to buy a 55 gallon tank for one musk turtle.

I am little bit worried because of a possible smell issue, i have seen smell threads here and in some other forums.

Some people are having issues even with canister filters and regular 25 % water changes. Is it that bad or is it overblown? I do not want a stinky livingroom, lol. Users in this sub, are your turtle tanks odor free?