thank you for all your advice see i have talked to several pet stores and every one says that a 55 gallon is ok, but not to go any bigger. Yeah that was my mistake for leaving the rat in there over night, well i will be putting him back into his 30 gallon then tonight, see this is why i love this site. all of you have been a great deal of help. If there is anything anyone would like to add please do.

Thanks again