Mallorie, we have a Desjardini and he looks a bit cramped for space at times in our 300g tank. All he has to do is flick his fins a couple of times and he's at the other end of the tank. We've had him for 9 years - a "free to good home" because he had outgrown the tank he was in.
We added one of the big Tunze's to our tank that we run full blast during the day just for him - sort of a "personal endless pool" so to speak. As someone else mentioned, they do require a lot of food and trying to target feed is pretty much pointless, LOL.
Yes, you could keep a smaller one in that size tank for a while, but it really won't work longterm and you'll have to find him a new home.
-Terry