Will die
No. The temperature variation will kill one or the other. (Too warm for cold water fish, too cold for tropical fish)
It depends on the fish. tropical fish need warm water, goldfish and koi like colder temperatures. You have to know what kind of fish it is to really answer this one. Ask the people you buy the fish from what temp it needs.
Simply put, they will die. Goldfish are coldwater fish and if their water gets too warm, their metabolism speeds up. Their bodies then demand more oxygen for them to survive. The warmer water is, the less oxygen it can contain, so coldwater fish simple die from lack of oxygen in warm water.
It should have good water (warm) not too hot or not too cold, and a good temperature.
It can either Mean the lighting is too bright or the water is warm
The reason they are called 'tropical fish' is because they come from tropical areas and need warm water to survive. They have evolved to live in warm water over millions of years. If they are placed in water that is not of the correct temperature (either too hot or too cold) the fishes metabolism will not be able to cope properly and depending on how much difference there is between what they need and what they are getting they will live or die accordingly.
If the water temperature is too hot or too cold, your fish will be stressed and may die.
No. There can not be too much oxygen in a fishes water. If a fish is swimming upside down and it is not of a species known for doing that, then the fish has a damaged swim bladder. The fish is very sick and will die.
Most tropical fish are normally kept between 70F and 80F but some species will die if they are kept in water below 75F. Others will die if they are kept too warm and 70F will be too hot for them to live. Bettas will die if they are kept below 65F for long periods. For them to live a healthy and normal life span, Bettas need a temperature range of 75F to 80F
The same as warm water fish only you do not need a heater and you typically should to keep an eye on the temperature to make sure it doesn't get too hot.
No, it will not. The sperm are housed outside of the body because it is too warm inside. If it becomes too warm, the sperm will die. If it is way too cold, it will die as well.
Yes, if they are cold water fish and they are in there for a long time. Tropical fish could stand the water a bit hotter. But not too hot. Though i would'nt try it.