what is the fastest growing bichir that could still be housed in a 180 gallon tank(6'x2'x2'). I have a 10" ornate bichir but would like to get another monster. I would like to get one of the huge species if reasonable. So what species would be good with my ornate and tank that would get big and get big relatively quickly. I know ornate's get big but i have had him almost two years and he's grown maybe 6".