Planted Tank Enthusiast
Join Date: Sep 2014
Location: Minneapolis, MN
My experience with hairgrass is that it's difficult to grow in a low-tech (no CO2) tank. It'll hang on for a long time and then die off. BUT, it's always worth a try.
I like the livestock choices! Badis are awesome. They, and bettas, are quite predatory, though, so I wouldn't expect cherry shrimp to last very long with them unless there are a lot of hiding places.
As for betta with other fish, I have always found that they settle down eventually and are not a problem with other fish. I have never lost a fish to a betta. I've found the bettas I've kept to be all bluff and no bite. Yes, I realize others may have different experiences. Personally, I think people don't give bettas enough time to mellow out. It takes a few days, and the bluffing might make you want to remove them before they mellow out, but stick it out, and you'll be fine.
I think you could definitely add more fish if you wanted, too, although I understand and appreciate a low-populated tank.