I have this Black Ghost Knife Fish in my 40 gallon community tank. I got it 2 1/2 years ago when it was only about 3 inches. Now it is 7 inches long and still growing. As these things get massive, will they eat the other community fish? I have Emperor Tetras and another small tetra species with it as well as angelfish. Will I have to move it soon? It's doing perfectly fine right now and so far is not bothering anyone. Very peaceful