goldfish has small bubbles, isn't eating, at bottom of tank? help

[pipilin]

I have one goldfish in a tiny tank that I know is way too small and doesn't have a filter or anything, literally just a plastic box with tap water. (I'm going to get a bigger tank in the future)
My goldfish recently hasn't been eating anything and is just sitting at the bottom and there're little clear bubbles on its mouth, sides, and a few places else but not a lot of bubbles. A few hours ago it seemed to be shedding or something and there were transparent fiber-y things coming off its sides. Also it's been pooping a lot more than usual, maybe overfeeding? The poop is in long strands and there are clear parts.

As for specifics about the water condition, I don't have any, but I change the water about every 3 days and my goldfish has been living well for over a year in the same conditions as always.

 

[FreshyFresh]

A goldfish in a bowl type container should have daily (full amount) water changes until it could be moved into a proper home with a nitrogen cycle to process the ammonia the fish produces.

Your fish sounds like it's suffering from exposure to high levels of ammonia or nitrate.

 

[pipilin]

My fish seems fine now, I think it's just overfeeding. I'll follow your advice though, thanks!

 

[JoshuaLongo01]

If the things are white it could very well be a sickness for the fish. My friends fish had it and I'm not sure if it survived. I don't know a bunch of info about the sickness but it could be. Ask a vetranarian. Or someone who works with fish.