you cant mix lower an upper jaw's from what ive heard but yea you can do 2 del's i got a friend who has a 75 gallon thats goin to be pushin 15-20 bichirs.
I was afraid you were going to say that. If I get lucky and convince of 75Gal. What other fish could I put in there with it out of curiosity? Maybe a Dat or 2?