That would depend on the tank setup, metabolism and water temp. Activity level doesn't go within certain species of bichir but each individual bichir have different activity level.
My most active bichir right now is my 20" koliba and I also have a 18" koliba which is lazy. Same goes with some of my endlis and polli which are active and some of them are just lazy. As I said it again it doesn't go with certain species but each individual. Just like human beings, most are lazy and some are just hyper active especially during the weekends .Lol!
I would say Sene on 1st place, Palmas on 2nd. I don't see much of my del's and the ornate and endli's, they seem to be active, but when I go in to the snake room, they dash and disappear at once.
I have some nice "floating" pics on an ornate somewhere...