this 90 that i have don't know if its home made or meant for something else. the rim stock is not very thick, and its got a separate piece on each side. the corners are cut on a 45 and glued on. my other 90 gal. has thick rim stock and a large support in the middle of the to and bottom. the guy i got it from had fish in it but it just seems weird that they would make it with out some kind of brace. IS THIS SAFE OR NOT ?? if not where can i get rim stock and for how much?