I have a custom made wood aquarium that is conical and fits into a chimney insert. Has been used by a friend of mine for many years and is in perfect working order. The tank has been in use for more than 10 years and is not leaking. Tank comes with the glass lids for the top cover. The dimensions are: Front glass: 34.5" x 22" depth: 18" Back side: 27" x 22" Side length: 18.5"