what makes a fish's health get worse every minute though all aspects are fully researched, all stuff installed and the magic fish of health, sustenance and curing around him? my only magic fish of growth is dying. what can i do to restore him? i have deleted all his ancestors. it will take quite a while for me to breed another. many thanks!

do you have dead fish in the tank?

well, not yet.
but, haha, i think i figured out what had happened.
i keep this magic fish in my sale tank to nurture generations after generations of babies. other babies go and but he lingers, so he swallowed a lot of the hormone. now that i stopped messing with the growth rate, his health gradually climbed back from red to yellow to green. i won't use it again!