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a fancy guppy in my tank is very active but not eating. this is very strange to me because he is the one in the tank that eats the most. ive looked at him very carefully and he isnt showing any signs of stress, finrot, or any other kind of disease ive researched. can someone help me out?

also i only feed him and his tankmates flakes. could it be that hes just bored of them?

Hi,
With all the disturbance, of cleaning the tank and removing one of its neighbors, you might want to hold off a bit before worring.

That reminds me, with all the cleaning and large water change, do you have a water test kit? Along with my other post about the Nitrogen Cycle, you, especially now after the massive cleaning, should be testing the water to know where the ammonia and nitrite values are. If they are allowed to climb too high, the symptoms you mention could be the result of ammonia and nitrite poisoning. If you don't have a kit you should take a water sample, in a clean container, to your local fish store and ask them to test it. Very nearly every fish store will test your water for you for free. They do, however, expect you to purchase any additives or medications from them as pay back.

The API "Master Test Kit" is excellent and is the one that I use all the time.

Frank

-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--

today i fully disassembled the tank and thoroughly cleaned everything, as well as boil the gravel and then vac it heavily to make sure everything was out of it. i kept about a liter of the old water to add back as a sort of starter culture for the bacteria. the tank is now crystal clear and now that i have the right supplies i can keep it that way. i dont have any money right now so buying a test kit or meds is out. the fish have been in the new water for about an hour now after having been properly re- acclimated and are showing no signs of stress or disease.

I would say that maybe the guppy is pregnant.. they act a bit different when they are getting ready to give birth. Since it is a livebearer.. the babies will come out alive and most likely get eaten very fast. Sometimes i have seen the mother eat them right after the birth of them...

they were both males. and one died recently

This is the simplest type of aquarium fish)

If your guppies are sick then hobi hobi may not suit you at all. In this case, I would recommend that you check it, for example, using the magic of numbers, at https://www.sunsigns.org/angel-number-666-meaning/ you can find out your lucky numbers, as well as numbers that do not suit you , this will allow you to recognize your hobi.