The wet kind!
Actually fish are quite fussy about the water -- get it wrong and you can kill them. It should be dechlorinated, at around 24 degrees celcius and pH 7.0 for a "community" tank. Some species of fish require different pH values, but if you are asking this question you are not experienced enough to keep these yet.
The water should also have been in the tank with all the equipment (pumps, filters, heaters) turned on and the gravel/planting in place for at least a week prior to introducing your first few fish.
You will need to monitor phosphate and nitrate levels before and after you introduce any fish - testing kits are available from your local stockist (I personally prefer the paper strip type which tests for everthing in one go).
Your stockist will also advise on setting up a new tank and which fish are best suited to be introduced first, and will get along together in a community tank.
This depends on the kind of fish, if it is a tropical fish, warm water is better. Hot water is not a good idea to use because I am pretty sure it can kill the fish. Most of the time you should use cold water....
It is a kind of tropical fish.
No fish is really "dirty." I have heard of goldfish clouding up water faster, but I haven't raised goldfish in years. All I have are tropical fish.
Guppies are tropical fish and should be kept around 70F to 75F.
Newts are Amphibians and should NEVER be kept with tropical fish or fish of any kind for that matter. Amphibians foul (poo and piddle) their water and breath air. Fish need pure clean water to breath. The fish will be killed by the foul water even if the newt doesn't bite them if you try to mix the two.
One should know first what kind of tropical fish can be kept together, in what type of fish tank the fish can be kept, what sort of equipment is required for the fish, how much money are needed for best life of fish and for daily food. Additionally one should also consider the space required for the fish tank and time required for the maintenance of fish.
Betta, goldfish.ex.
The acidity of your tank water can kill your fish or make them sick. Before deciding on what fish you want to put in your tank; you should ask your local pet-store what kind of water the fish prefere. Some fish like hard water (high acid) and some fish like really soft water (low acid). Most fish at the pet store will be happy in moderately acidic to soft water. I keep my tank at 7.0 on the pH scale.
It depends on what kind of fish they are; tropical fish will reproduce many times in a year, whereas many temperate species will only do so once a year.
Room Temperature (*does not matter as long as you don't throw ice cubes in the tank or heat it up on the stove) But when you purchase them with the bag containing them, do not immediate throw them into your tank; instead, put the bag with the fishes into the tank (filled) and so they can gradually adjust to the temperature in your tank. Seriously, people makes this too complicated sometimes. They are fish, really easy to take care of. I have gold fish and I have never bothered with the temperature, they are healthy and lived more or less to their life expectancy.
Fish are usually transported singly in plastic bags designed for that specific purpose. Sufficient water is added for the fish to live in then Oxygen is used to fill the bag and then it is sealed with some kind of tie. If the fish are tropical they can then be placed in an insulated box.
thin clothes with lots of water (ex:bathing suit)