Top Fin Retreat RF-S Filter Cartridges (Small) Refill for Desktop Aquariums with Small Retreat Filters - 8.1in x 1.9in (6 Count)

Hard to find.

I bought a used tank and wasnt exactly sure what size the filter was, but the descrition was exact and I ordered the right size the first time.

Convenient. Easy to change.

Works great for the filter. Easy to change cleans the tank flawlessly

fits perfectly

Works well fits well does the job

For my fish tank

Exactly what I was looking for!

Gets the job done and excellent quality!

Good packaging, easy to use