I know this is a site for chickens but.... I am looking for filters for my fish tank it is a 30-40 gallon tank. One is a filter wheel it measures about 5 1/4" long. the other is supposed to fit an eclipse 2 or 3 filtration system. I believe it would be a size H. send me a pm on prices..thanks! PS. If anyone can tell me how to post pics on here, i will add them! thanks!