How well would a 72x18x18 aquarium do for the upper jaw species? I found a used one and may settle for this if I can safely house several bichirs in it. I know that it pretty much eliminates all of the lower jaws as long term. Right now I have 6" senegal, 4" albino sen, 5" delhezi, and a 5" ornate. I plan on getting a couple of palmas and probably a retropinnis eventually. Would it be better to go with a shorter and wider tank?