Had a Chaca Chaca, DO NOT MIX IT WITH ANY OTHER FISH! I figured it would be able to go in with my Tetradon Suvatti A/K/A Arrowhead Puffer. BIG MISTAKE. Arrow head took a big bite out of him. It was in a divided tank. Chaca can release a TOXIC Toxin and caused me to loose several hundred dollars worth of fish on other side of devider. Lost 6 exotic L type plecos, 1 datnoid, 1 baby flagtail and a bunch others. Even arrowhead got very sick, eyes were fogged, was able to save him. Maybe this would never happen to anyone else, but I just want to warn about what happen to me, so it doesn't happen to anyone else.