I have a 125 gallon tank for about 4 months now and haven’t had too many problems after a month in. Today I fed them as i usually do flakes, pellets and some live minnows. Often ill substitute flakes and pellets w blood worms and brine shrimp. I came home an hour later to my bichir upside down on the substrate. I took it out and it was all red near the tail see the pictures. I have no idea what happened. 
