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

We use these for a 2.5 gal. tank with a male Betta. These filters work well and the water remains clear for 1 month. Please be sure to rinse a new filter with clean water to remove all charcoal dust before use.

Usability

Great product

Works well fits well does the job

Expensive

Cleaned my tank within minutes

Able to find this item it was sold out in stores

quality is what is expected

Convenient. Easy to change.

Hard to find.