Alright so i have a 2.5 tank which HAD a 3i filter which sucked so i took it out.
right now i have my betta in an unfiltered tank doing 100% tank changes every 2 days been doing this since thurs of last week until i can go get the supplies for a DIY sponge filter.
ive had my betta since early Aug. i started noticing changes to his fins. Maybe he's still growing ??? i dunno let me know what you think
here are pics