I have breed these a few times and IMO EVEN AT THIS SIZE THEY ARE STILL VERY VERY AGRESSIVE AND WILL KILL AND EAT other fish of similar size and they will also bite the hands that feed them
i would say i had two large gold fish in the tank for a week to cycle it and they were 3+'' and this little guy killed one in the first 6 hours lol. i knew they were mean but damn getting a 210 for it this weekend hopefully. the tank is going to be empty with a 1.5'' fish in a 210 by its self any filler ideas
ya im figuring that out i thought they can be in there til he was atleast 5'' nope, these fish are quickly becoming my favorite fish and mine is only 1.5''