I have tried my hand @ BGK with no luck. They seem to last a total of 15 days and then die. The last 2 days or so when they swim they usually go in circles and when they stop they're on their side. I never saw them eat; and I fed right before I turned down the lights for the night. Their tank mates @ the time were two 4" senegal bichirs which never picked on the BGK. The knife was the same size as the bichirs. Any ideas on what went wrong?