nkh wrote:

i have one goldfish ("smokey") that the other two ("snoopy" and "koda") will
occasionally nuzzle/chase/follow/harass. most of the time, they all get
along fine and usually just ignore each other. but, every once in awhile,
they start this weird behavior. at the same time, smokey is also acting
strangely...like suspending herself facing down...or, hiding in a cave. what
is going on? is it possible that smokey is female and snoopy and koda are
males and it is "that time of year"?

Yep smokey is likely to be female. I stopped my male chasing the female by
keeping the water temperature stable - no fluctuations - bang on 78oF now
and always.