It depends on how many fish you have in the tank and the type of filtration you have. If the tank is heavily stocked then the water should be partially changed every week - around 10-15% is fine.
You need to moisturize the tank 2 times a day if it is a garden snail.
when the water starts to get dirty if it is a bit dirty then leave it when it starts to get really dirty clean the filter and your fish tank
Put it in a bag of water until you've finished changing the tank water.
If water doesn't go into the pressure tank you will not have water pressure.
Any aquarium filter can help to reduce nitrates in a tank, but the two main keys are that you need a filter rated for your tank size (although rated for a larger tank is better), and you need to do regular weekly maintenance which includes changing at least 50% of the tank water on a weekly basis.
yes
A 1 gallon tank could have one betta fish, but you will need to be diligent about changing the water on a regular basis. The smallest tank that should be used, even for a betta, is a 2.5 gallon tank as it at least gives the fish swimming room.
I dont
Generally a filter on a fish tank needs to be replaced once a week. If the fish tank is especially dirty, then it may need to be replaced more often than that. Generally, the more fish there are in the fish tank, the more often the filter will need to be replaced.
No you don't need a tank to simply pump water from a lake. You would only need a tank if your using a pressure switch to turn the pump on and off.
The water in the tank that you are transferring the angelfish to should be the same temperature and PH of the old water.If you are adding them to your tank from a fish store, then you should acclimate the fish first by floating the bags in your tank, and every so often add a bit of your tank water to the water in the bag to avoid temperature or PH shock.
Goldfish first need to be acclimated - the water in the bag when you buy a fish is different than the water in your tank - you need to float the bag in the tank for several hours and every so often add a bit of your tank water to the bag. The reason is that the temperature and PH are always different, and the shock will kill the fish.