I have this empty 20 or 30 gallon long and I think I would able to divide into 6 (for my six bettas) 2.5 per betta or 3 per betta. I got this tank like last year from my sister's friend. Nobody knew what gallons this tank would hold. It looks like 30 or 20, I'm not sure but it's long enough to hold several bettas.
The sponge filters will be in this tank. probably about 4 of it & a couple of heater whisper tetra for ten gallons.
All of my bettas are fairly healthy and eating just fine.
Only two of them have problem with swim bladders but always went back to normal.
I would add some new bettas but I'll have to put the new bettas in other tank for quarantine to see if they are okay to be added with my six betta clan..
What do you think? c:
Thank you so much for looking & the help. c: I'm excited to start this mini project..