I finally replaced the stock box filter/light combo on my son's Fluval Chi betta tank with a Jardin double sponge filter and a Finnex Stingray LED clip light. : r/Aquariums
Fluval Chi: Simple Tabletop Aquariums
Chi Replacement Filter in light cube - Fluval UK
Fluval Chi Filter Pad 3 Pack – KensFish.com
Fluval CHI II Foam Pad 2 Pack - in Grandville, MI - Blue Fish Aquarium
Fluval Chi Filter and Foam Pads | Petco
Filter Pad for Chi Aquarium Kit, 2-Pack - Fluval USA
Fluval Chi Aquarium Kit, 5 Gallons | Petco
Finally got tired of the underwhelming performance of the Fluval Chi filter and upgraded. (AC20 & Finnex Ray) : r/Aquariums