I think the gar did it. He did not eat for almost a whole week and I noticed his stomach is still pretty meaty tonight. A fish that did not eat for a week should have a sunken stomach. I am still shocked he was able to swallow a datnoid. It was a good size NTT and have lived with the bass for 3 months without any issue.
he live with the basses several months with no issues. This tank was used as a growout tank. I recently moved the gar in there because it scratched my show tank. He never show any sign of aggression toward my baby bichirs so I thought it might be ok.