beblondie said:
The water level needs to be 2-3 inches below normal
Hi beblondie, I recognize you from the aquatic predators board... you're basically the resident bichir expert over there, so welcome to AC! (sorry if you've been here a while, I haven't been on these boards for a while).
Anyways, just wanted to share my experience; I currently have five 6-7" juvenile bichirs (2 albino senegalus (1m, 1f), 1 ornate, 1 delhezi, and a reed fish) in a 180g tank. Yes they do need to swim 2' to get air from the tank surface, but they don't seem bothered by it (they swim pretty fast as you know).
As a matter of fact mine have grown acustomed to the deeper tank and when they see me near the tank, they all (except the ornate) swim to the top and hover, waiting for grub. The ornate isn't really shy since he doesn't hide from me when he's at the bottom of the tank searching out food, but he doesn't like swimming around as much as the others do.
Now for very small bichirs (i.e. the most common size to find senegalus babies for sale) I don't think a 2' deep tank would be the best idea, but 2-3 inches below normal isn't really a big difference from what the normal water level of any of my tanks are at. All that would do is make the filter splash louder
So I guess I"m just curious why you recommend 2-3 inches specifically?