ive had my pedro for yrs. he has a zen tank that is square & 1gallon. he is the most social fish ive ever seen. the minute u wake up he flies out of his rock to greet u n will almost like talk to u at the top of water for as long as u stand over it. he has always loved his hitari gold color enhancing micro pellets and his dried blood worms and gobbles them as soon as they hit the water. for the last month he has had an extremely hard time eating. he completely misses the food everytime he tries to eat it n gets very angry n starts charging it... still only to miss . then he gives up. once in a whiel he seemed to be able to grab a blood worm but now he cant do that even. he barely evn trynig anymore. this fish means so much to me bc a very special person in my life who is like a mom i never had, gave him to me. she moved away and that was so hard on me but she said i have her with me in pedro. so many bad things have happened to me in last few yrs and that fish helps me so much. he has never had a heater or a filter & the pet store told me they like slightly colder temps, but as ive read some threads im getting the opposite msg on here. he was the coolest deep purple (almost black) with metallic blue shimmer in light, with deep red tail w a aqua blue metallic shimmer in light. now hes very faded, which im guessing is due to his lack of eating. he wants to eat but cant seem to. its almost as if his mouth shrunk. im really hoping someone has heard of this. i have some extreme livnig situations going on rite now so hes ben at my best buds house for a few months, plus we had a natural disaster flood happen. hes been totally fine through all that and i visit him almost daily. please if anyones has ideas let me know. he gets a complete water change n tank clean every month. i use distilled water and Dr. Tim's "one and only" each time. in between, his tank is absolutley pristine. he gets more water added wen needed, with half cap full of beta+ conditioner. if i forgot any info let me know,. thanks fro your time!