I would like to know the exact dimensions for the Hydro I Sponge Filter here: Hydro Sponge Filter on amazon In the Product Features it states: Sponge: 4 1/2" diameter x 2 1/2" high Lift tube: 1" diameter x 5" high Whole filter: 4 1/2" diameter x 9 1/2" high But... It seems to me that a 2.5"...