Logan and Cleo’s tanks are clean and safe

Keeps tank clean.

Keeps my tank clean!

Using in my one gallon Top Fin Betta tank

Keeping your tank nice and clean

Used these filters in replace of my EF-S filters for my Top Fin Beta tank

My fish seems happy and his tank stays very clean

These little filters keep my sons goldfish tank clean

Tank is always clear

They seem to be doing a good job of keeping the tank pretty clean.

I have a beta fish in a small tank with a filter and these cartridges buy me an extra 2 weeks before having to clean the tank.

Keeps my tank clean.

I did find that adding a small filter system cut down on my cleaning his tank.

Keeps the tank clean as long as you change it every 10 days.

these ex-smallfilters are so great the tank is so clean and they are so easy to install love them

Cleans my tank like a charm

This keeps the tank clean for a month maybe more.

Keeps tank clean

I seem to have to clean my whole tank every week to week and a half, otherwise it gets bacteria and my beta gets sick,so I run the filter without the filter cartridge... it at least keeps air circulating through the water.

my tank stays clean when i have it in and isn’t too loud.

Keeps the little tank clean for about 2 1/2 weeks

Without the cartridge I must clean the tank every other week.

They keeps my tank cloudy

but I never have to clean the tank as long as a consistently change the filter.

works very well in our Betta fish's tank

Great for desk top tank,

Works perfectly, came in quickly, and keeps my tank clean for a while!

n’t interfere with water flow

Work as they should for a nano tank

All I can say is they work as they should