A pair of convicts. they are pretty close to being a predator. If you had a 40 gallon tank i would recommend a Asian upside down catfish. but an AUC would be miserable in a 27 gallon tank.
They're cool, more manageable than a 15" fahaka puffer.
I saw some dwarf puffers at my LFS, but any puffer could be "dwarf puffer"
they will stress fish to death. It stressed my 7 inch pearsei cichlid out so much he died from suerside and stress. so they should be in LARGE tanks with big fish. or by themselves. i would really recommend a 40 breeder with over filtration for 1. i might need to get my 8 incher a bigger tank or put him in my bigger tank if he gets to big. if he gets 12-14 inches i will. For now he is fine in a 40 gallon bow front by himself.I do have a 40 gallon, it's not empty though.