I tried a Betta once in my 33g together with 20 cardinal tetra. Went fine for a couple of weeks...Well, when choosing a betta tank mate they should have short fins, be relatively small and be assertive, so they can defend themselves from the betta but not attack it. You could try a shoal of neon tetras, they usually keep their distance from bettas and if your betta is mellow he shouldn't bug them.
I usually add 1 or 2 cories to the tank, I've yet to see a problem with only a couple and I've done this setup at least 4-5 times. Dwarf frogs are great tankmates because they also breathe air, eat pretty much everything, and don't bother the betta or vice versa. I also currently have a 3 gallon setup with 3 ghost shrimp, at first the betta nipped them, but now he leaves them alone. They are a nice algae cleanup crew too
Nah, they just sit on the bottom most of the time, except to breathe or find foodIt's so hard to decide whether I should get a cory or a frog
Does the frog jump because otherwise I don't think I can get it because the lid no longer fits on my tank and I don't really like it. My betta doesn't seem to want to jump, but I watch it anyways.