Quoting Piranha-info.com -
http://www.piranha-info.com/default.php?lang=en&id=s_rhombeus
"Live fish need to be quarantained first, so they are safe to feed (containing no disases or parasites). Goldfish, minnows and other members of the Cyprinid family (Carp-like fish) should be avoided, as these fish contain growth-inhibiting hormones (Thiaminase/Vitamine B1 inhibitors) that could negatively affect the fish's health and development."
Learn something new everyday. I've grown some pretty large fish on feeder comets but the aboves got me thinkin' twice.
http://www.piranha-info.com/default.php?lang=en&id=s_rhombeus
"Live fish need to be quarantained first, so they are safe to feed (containing no disases or parasites). Goldfish, minnows and other members of the Cyprinid family (Carp-like fish) should be avoided, as these fish contain growth-inhibiting hormones (Thiaminase/Vitamine B1 inhibitors) that could negatively affect the fish's health and development."
Learn something new everyday. I've grown some pretty large fish on feeder comets but the aboves got me thinkin' twice.