Long sorry short I got a used 30 long from a friend for free and set it up in my dining room. It's been setup for about two weeks now with fish in it (already cycled) and I noticed a small problem. When setting up I noticed the glass looked slightly foggy but there were a few oval shaped patches here and there that is was clear. I though water would make it go away since it was on the inside so I didn't mind it. Once setup I thought the cloudyness was from the decor loosing some dirt particles or something like that. Well at this point it's still cloudy and I can once again see the cloudiness on the glass with the ovals on it. This isn't a fishroom tank it's a display tank in a busy part of my house so I'd like it to be presentable and don't want dirty glass. I have no idea how to fix it or if it even can be fixed but it's annoying as heck, I'll upload pictures when I get home later.