Thanks … 2 lake tanganyika congicus in there already that quickly became my favorites. I do want some cogo congies as well tho. As for the water level, ive always kept cats, gar, knives, rays, lungs and other air breathers, air gulpers or jumpers. Gives the fish a bit of an air gap and also gives them room to jump before just smashing a lid immediatly. It also relieves a bit of pressure on my older acrylic tanks.damn that bichir tank is awesome. My bichir setup looks kind of like your with the dark blue back.
You should really get a couple Congicus. It’s the my favorite bichir over the PBB.
Btw, is there a particular reason for the water line at the top being so low?
I keep weights on all my tank lids also. Every type of fish comes up to roll for air. Its inevitable they’ll smash a lid or try and bail eventually. My CK’s have the same amt of room around 3-4” at the top. I can still hear them hitting the lids at night lol… id rather have a bit of cushion to give the fish room and less chance of injuring them selves or bailing out.