I have a jeweled eel in my 90. He doesn't bother the big fish or the crabs, but he will eat feeders and he doesn't let the triggers boss him around. He is always active and hungry. He will come right up to the top of the tank to eat with the triggers. He has scared me a few times I thought he was going to jump out of the tank when I was feeding. He has gotten about half way out before I shoved him back in.