What type of divider did you use?
I'm still going to try it. I'm actually working with my dad currently to create some type of filtration that goes along the back of the tank (shortening the individual sections by about 1-2") and then sponge filters in each section, since they're pretty cheap and easy to replace.
We have a general idea for how the dividers are going to be placed and I'm researching non toxic black paint for the dividers, tiny holes drilled into them for circulation but not big enough for them to really see each other. Considering making individual coverings for each section so they're unable to jump, but I have uncovered tanks now with no problems as of yet (not saying I WONT...just don't have any currently, I'm watching them though). I could also go with the option of no holes on the divider and only on the back filter section
I like the basic idea of this
https://rover.ebay.com/rover/0/0/0?mpre ... 1423034507 but bigger, better, and more suitable for bettas (i.e. Black dividers so they're not in "fite me" mode all the time)
Idk. It's still sort of up in the air until I can afford it next month, but got some ideas flowing!