Thanks. I'll try to clean the glass a little bit, and get some more shots. It was hard to get a profile shot, because they thought it was time to eat, and were all facing me swimming back and forth.
Nothing else can be in the tank, not even a Pl*co. It attacks the gravel vac when I clean the tank, and sometimes goes after fish in neighboring tanks. It will occassionally attack me through the glass, but not very often.
I like the dempsey, I am raising 3 electric blue jack dempseys. When I throw guppies in the tank, they each attack the same fish until it dies. Its like they have fun working as a team killing one fish. When they are done they move on to another one until they are dead then they go back to eat them. I have never seen that before and I waiting to see how old they will get before they go their own ways.