Personally, i dont have a filter on my toads, but i spot clean their enclosure daily. generally Fire belly toads don't like strong current. I would suggest keeping the filter if you are worried about water quality but if you are prepared for the small hassle of spot cleaning, you can leave the filter out. But before we consider these options...

- How large is the tank?
- What's the tank setup?
- What's the temperature?
- How often are they fed?
-What's the quality of the water?