From what I have read, Badis need space. In a small tank, they are a bit more territorial. (also depends on the fish) Don't add anymore inhabitants and keep an eye on it. If he doesn't stop the chasing in the next few days, you may want to separate him.

 

Basis are basically cichlids, they are shy when it comes to other of the same kind but when they are with tetra they will probably bully them especially since a 5 hex is more tall than wide. Also most fish will eat shrimp so be careful what u stock shrimp with

 

Mine is the least shy fish in my tank... and also one of the smallest. Everything else swims away when I approach but he doesn't even care when I stick my hand in the tank and actually swims around it hoping I'll stir up some food. He also bullied the other scarlet badis male I bought with him until the other one died. In a 36 gallon tank. He doesn't bother my adult shrimp but I know he's eating shrimplets all day long cause I see him stalking them in the moss

 

Mine are shy also. I have 15 in a 60 gallon. I have lots of plant and small pots in there for them to hide in. A lot of the cherry shrimplets in there became food. They don't touch the larger ones. I also have 3 in a 5 gallon hex, 1 male and 2 females. They swim all over to eat the micro worms that swim around. I plants and driftwood in there as well. You shouldn't put more than 1 male in the tank. They need a large section all to themselves. The dominant male will kill any other males if the room is too small.

 

Thanks, everybody.

I haven't seen the same non-stop aggression that I did the first morning, but he does keep pestering the tetras every once in a while. They just swim away when he does. He'll chase one, then get distracted chasing after another.

Thankfully I did know not to get more than one male. If he's this way with the shrimp and tetras, murder would probably be done with another male.

I'm not sure how much aggression is too much. I also am remembering with fondness when I actually got to see my shrimp. I keep waffling back and forth. There's no denying that he's curious and fun to watch and full of personality.

I'm not sure what to do. Does anyone have an idea of how much aggression is "too much?"

 

Encouraging news. The Adonis Tetras seem to be relaxing a little, and I've had a shrimp go out and about in the open for a long while tonight. I'm starting to get some hope that things may be ok.

 

Final update: Everything's calmed down, and when I look at the tank, I finally see happy inhabitants who are coexisting just fine.

Thanks to everyone for your advice. I'm glad that waiting it out worked!