I have a 150 gallon tank, 5x2x2, and want one or a trio of dats, my lfs has some ntt dats for sale, I wanted to know if three dats would be too much for that tank and also what tank mates would work for for either combination, would it make a difference if I got three AT dats, i want the tank to be active and entertaining with regards to tank mates for the datnoids. Do you have any suggestions?