Since my betta's fins are getting torn from my current filter, I was thinking about switching to a sponge filter. I was pleased to find them very inexpensive on amazon. However, I don't know much about them so I was hoping someone who uses a sponge filter would be able to answer some questions:
Do they keep the water as clean/clear as a power fliter?
Do you have to replace the sponges, and if so how often?
Is the current it creates more manageable for a betta fish?
Do you recommend a certain brand or certain kind of sponge filter?