A hobbyists favorite sponge filter. Shrimp safe and fry safe the sponge filter is perfect for keeping virtually all sized tanks filtrated and aerated. 
 
Save space in the tank by attaching the filter to the wall, and enjoy the view of your tank. 
 
Specifications
Small:
Base is 5.5" wide
Sponges are 1.8"x3.1"
 
Medium:
Base: 6.7"
Sponge: 4.50"x2.25"