Sitting on the Bottom: If your fish is spending lots of time at the bottom of the tank, it may be normal behavior. If you think this is the case, you should quarantine the fish. A common disease that would cause this behavior is a swim bladder infection, which is a result of a poor diet or water quality.

Goldfish usually huddle together when they are stressed. Various conditions such as an overcrowded tank, poor water quality, lack of food, heavy water flow, the presence of bullies, changes in the water temperature, or unfavorable environmental conditions can cause the goldfish to huddle together.

This is when fish constantly swim up and down the sides of the aquarium glass. One reason they do this is stress. It could mean they aren’t happy in their environment, for one reason or another. Watching out for signs of stress and taking action to reduce it can go a long way toward keeping happy, healthy fish.

If your fish are digging around in the substrate, clearly searching for something, chances are that they are hungry. Fish that go to scavenge, but don’t usually scavenge, or go inspect the top of the aquarium, something they wouldn’t usually do, are both indications of hunger.

Pellets. Almost all goldfish diets will start with the pellet vs. flake debate. Very small fish will likely need to start with flakes, but as soon as your fish graduate to having a mouth that can handle a small pellet, it is better for their overall health.

Remember as most dry food, pellets will expand when soaked in water, so if your fish eats the pellets before they expand this can cause problems with digestion. For this reason, you might want to soak the pellets before adding them to your goldfish tank.

You can feed various vegetables like peas, spinach, kale, etc as well as fruits like grapes, orange, watermelon, apple, banana, etc to your Goldfish. Besides, some people also feed oatmeal and cooked rice to their Goldfish.

about 10-15 years

10 Best Goldfish Foods You Need to Try

1. Saki-Hikari Fancy Goldfish.
2. Vegetables.
3. Frozen Fish Food.
4. Hikari Cichlid Excel.
5. Repashy Super Gold Gel Food.
6. Xtreme Pellets.
7. Hikari Gold.
8. Xtreme Spirulina Flake.

Goldfish don’t naturally sleep at night, like people do. They do sleep better when it’s dark and quiet, so many fish will sleep at night. The light should not be on for more than 12 hours a day, or fish may not get enough rest.

Goldfish love having some algae in the water to nibble on whenever they feel like it, and since goldfish are always hungry, this ‘salad’ is a perfect way for them to further their nutrition and thereby grow faster. This is one reason why pond fish grow so fast.

Goldfish can live in dirty water only for a short period of time. However, it will die if you keep it in dirty water for too long. Dirty water will shorten the life span of your goldfish. Just like all other species, goldfish need healthy living conditions to survive and thrive.