We keep our Bichirs in a tank with a strange foot print. It is 4 feet by 4 feet and 20 inches deep. In there we have 5 Ornates 1 Endi ! weeksi and a Lapardae we just picked up. They seem comfortable and I have never seen them fight for space. The Weeksi or Fat Head I think is my favorite because of his color. Although the Ornates are hard to beat as well. Do yours seem to know you and come to the front for food?