Would a full grown fire eel be ok in a 150 gallon? The tank is 4' by2' by 30" and has no way for it to escape. The setup also has a 35 gallon sump. The stockright now is an oscar and Dempsey. Both fish are really mellow and don't bother other fish. I have black gravel and background and think the fire eel would contrast in the tank cool. The fire eel is 20 + inches and if youve seen the one at petsoultions it looks like him. What do you think?