Goldfish

Goldfish (Carassius auratus) should not have bubbles on their scales. These could be forming because there is a surfeit of air in the water. Given time this air will dissipate and the bubbles will dissappear.

Here's the entire Classification.

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Carassius
Species: Carassius auratus

if its rectangular, often 24" x 12" x 12"

if its a 15 gal tall, often 20" x 10" x 17"

measurements are length x width x height in inches

exact measurements may vary slightly depending on the manufacturer due to glass thickness and whether they measure the inside of the tank or the outside of the tank.

Probably because its water is putrid. The basic requirement of all fish is pure, clean water. In order to provide this there are a couple of basic rules that every successfull aquarist lives by. "1 inch of fish needs a minimum of 1 gallon of water. All fish tanks need a cycled filter. All fish tanks need at least 50% water changed weekly. Follow those rules and your fish will swim. My immediate advice is CHANGE THE WATER NOW!!

I have heard that one fantail goldfish needs at least 20 gallons (91 litres) of water. This seems a little drastic, considering i was planning on getting 5 fantails. This means i would need 455 litres of water, i was planning on getting a 20 gallon tank for 3 fish, but some people think this is cruel. Can someone please tell me about how much water a fantail will need.

No. Presuming you mean the fancy Betta splendens, these are highly territorial fish that will chase and harass each other until one dies. Other species of Betta, however, are more peaceful and can cohabit in large aquariums, these wild species are less likely to be found in the average pet shop though.

The basics: The proper levels of: food, temperature, water chemistry (pH, NO2, NO3, NH3, NH4, KH, GH, etc), light, other things. And possibly: companions, mate, hiding areas, caves, plants, rocks, many other things. Please note that these factors will vary from fish species to fish species, so do your research.

If you don't have a pair of fish actively and obviously chasing around like mad spawning, whatever it is you are seeing, I can almost certainly guarantee that they won't be eggs.

They actually do bite!!! I don't think they are poisonus so, it should be okay and they have pretty small mouths so I assume it will not hurt so much! You never really know because they eat blood worms and shrimp, but, I think it would be fine. Check with your fish supplier, though- just incase!!! Natalie01

You will have to strip the tank down to move it. A large waterproof plastic bag is what pet shops provide for fish to be transported in. Another idea is a bucket with a lid. Just remember that they should only be in a small container for as short a time as possible. BTW a 30 ltr tank is not big enough for 2 goldfish to live and grow in. Orandas will grow to around 20cm in a couple of years. The basic rule is 2.5cm of fish needs 4.25lts water. Work it out.

Not in the way that most other creatures drink. They, and all freshwater fish, absorb water through their skin in a process called "osmotic action".
No, they are fresh water fish, therefore they simply absorb water through their permeable skin.

The red dot may be a natural part of its colouring in that case everything is OK, or it may be an erruption (Boil/cyst etc) of some kind under the fishes skin. If that is the case you may be able to buy some kind of medication at a pet shop. Either way I would be advising you to do regular water changes to reduce the chances of sicknes happening.

They are obviously not hungry. There can be many reasons for that. The most common reason is the fish are in poor water conditions and they are unhealthy/sick. If you have stuck to the basic rule of 1 inch of fish needs 1 gallon of water and your fish are not overcrowded the next thing to look at is when was the last water change? For fish to remain healthy a 50% water change weekly is a good way to go.

Yes. They are very social fish and prefer to live in groups rather than alone. If you're planning on getting a goldfish, please get at least two so that each one has a friend to swim around with!

Yes, The water will get cloudy and your fish will be unhealthy if you overfeed them. Feed the fish how much it can eat in five minutes once a day. you can feed them twice a day as long as you be sure not to go over the five minutes per feeding. Be sure to remove any uneaten food from the tank the best you can.

another gold fish or try asking someone in a pet shop that sells fish maybe they can help

There could be three explanations that come to mind immediately. Goldfish tend to orientate themselves according to the direction the light is comming from, so the light comming from the side, or not from above, could cause it to 'list". Then there is external damage where the fish has been injured and has damage to its swim bladder. Then last but not least there is bad genetics (inheritance) the fish may have been so inbred that there are genetic faults occurring. There is nothing to be done in the last two instances. Changing the angle of light if that is the problem is the only thing I can suggest.

I very much doubt if any normal light would be brighter than sunlight which is what Bettas evolved to live under. Lights can however be too hot and raise the temperature in the Bettas tank too high for the fish to survive.

Once the fry become free swimmers the adult male needs to be removed before he eats them. The babies will need to be fed very fine/microscopic food. This is available in most good pet shops. As they grow they will need to be moved into larger tanks and their food can slowly get bigger. When they are about 1/2 inch + long some will be starting to show that they are males by their colouring and fin development as well as their behavoiur. These will need to be placed in their own containers to grow on. A successfull spawning could easily produce over 100 males and the same amount of females.

Unfortunately, this sounds like "Swim Bladder Disease." Fish have a swim bladder that helps them to float up and down throughout the tank. When there are problems with the swim bladder, the fish will no longer be able to regulate its floating level in the aquarium. Goldfish are the most common fish to have these problems. It happens as a result of goldfish's eating habits. Goldfish will swim up to the top of the tank to eat their food, gulping air while sucking down their food. Unfortunately, this excess air that gets trapped in their stomachs and swim bladders causes the floating problems. Once a fish is showing these symptoms and can no longer stay below the surface, this situation will most likely be fatal. There is also nothing that you can really do. You can, however, make the fish as comfortable as possible by adding a product such as StressCoat to the water to reduce the fish's stress. Now, to try to prevent this from happening again, there is a better way to feed goldfish. Grasp a small pinch of flake food (use flake, not pellets, because the pellets normally can't sink) and hold it under the tank surface to ensure that the flakes are wet. Afterwards, release the flakes below the surface so that the goldfish does not have to come up to the surface to eat. This should help prevent the excess air from entering your fish's stomach and swim bladder.

I've actually had this happen to my goldfish. I took him out and put him in a small, clean coffee cup with fresh distilled water for about 30 mins. I cleaned his tank put him back in and so far he is still alive. Hope this helps.