I can't believe I didn't see this thread before. I'll join in with my splendens complex representatives.
I've been keeping betta imbellis since October and have really enjoyed them. Being able to keep them in a group and see the interactions makes for a great tank to keep in the living room. I currently have 7 (2 males, 5 females) in my 40g breeder. They have a support crew of cories, Amano shrimp, and a bulldog pleco, but the tank is really focused on the imbellis. They've really lived up to their names as the peaceful bettas. The most violence I've seen was two males in display getting into some tail slapping and pushing. I rarely see nipped fins and my females will hang out in the pennywort together during their afternoon siesta. They were juvies when I got them so it's been interesting seeing them grow up and set up a hierarchy.
Their tank is heavily planted, aiming for the overgrown look. I recently added IAL and am still getting used to the tannin stained water. I keep having the urge to change the water, even though my imbellis seem to appreciate them. The rocks form a network of caves. After a scare, it looks like I've got an empty tank until I bribe them out with bloodworms.
Sorry about the awful cellphone picture, but it's the most recent full tank shot I have. I do have better ones of the residents!
One of my ladies very dressed up.
Please excuse the algae, but the imbellis are very curious about the resident snails and the picture is too cute to not share.
I'm currently setting up a spawning tank for the dominant male and female (Big Papa and Dainty, yes, I've named them). With the other tank occupants, the big tank isn't really private enough for my imbellis. I don't have a good picture of the two of them, but they do hang out quite a bit and I'm pretty sure I spotted some spawning behavior after a water change with cooler water. Unfortunately the cooler water also set off the cories. It was a rather . . . exciting couple of days in the 40g. Love was in the air.
If I can successfully spawn the imbellis, my next species will be coccina. I have a spot set aside for a 20g long that I can set up as a blackwater environment. The husband really likes the look of them so gave me the green light to expand beyond my original aquarium quota. I don't want to get a species that's endangered if I don't think I have a reasonable shot at spawning them, so that will wait until I've had some luck with the imbellis.
I love all of the information in this thread and I'm looking forward to learning more!