If it's just a little off I wouldn't worry too much. In a shed it could still just be a little water damaged. Moisture can seep into sheds since they don't have a heat source to suck the moisture out of the air. If it isn't rocking when you touch it or cracking when you remove or add water I wouldn't worry but I would try to check around for a stand. I know they are expensive for 55 gallons though. You can try craigslist, ebay, or amazon for just stands.
I had a level issue with a 30 gal breeder. It was a pain to fix. I had to use base board and level it out that way. It was a three inch difference which would have made the tank itself really unstable. You could always try bracing it if you or your boyfriend are handy with nails and a hammer if you are super worried. 50 pounds is actually pretty light for a stand. is it pressed wood or true wood? Sorry for all of the questions. I feel for you. I don't have an actual tank stand under any of my tanks over ten gallons. I am using an old sewing machine stand from the 1950's, the bottom of a bathroom stand, and the bottom half of a china cabinet. lol
Keep yourself clean and bright, for you are the window through which you must see the world.
Last edited by Shirleythebetta; 12-29-2012 at 02:10 AM.