That's interesting Ive never heard that before. The upkeep is what scares me from getting one.I really want one! I'm in kind of a temporary place right now so I'm waiting until I'm in more of a permanent spot before I get one. I've actually heard the upkeep is a little less on a bigger tank because the water isn't so touchy. Not sure if that's true though. What do you want to put in the bigger one?