This will depend on your tank size, the fish you have, your stocking level, and whether you over-feed your fish or not. You should check it regularly to ensure that it is operating at full output, and remember to only rinse the filter media in a bucket of tank water (the bucket should be for fish use only!)
they ate fish for food and had sex
one time a month
you should change it every week so it will always be clean.
It is generally recommended to perform a 10-20% water change in your fish tank once a week. However, the frequency could vary depending on the size of the tank, the number of fish, and the stability of the water parameters. Testing the water regularly can help determine the appropriate water change schedule for your specific tank.
Yes, it is recommended that you change the water in the aquarium before adding a new fish, as the water may contain harmful substances that could affect the new fish.
Your Crawdad is a fish albeit a shellfish and needs exactly the same water quality as any other fish and the same water change regime. 1" of fish needs 1 gallon of water. 10% water changed daily is good. 50% weekly is not quite so good. Do both and you are doing great by your fish.
every two weeks then change the water every four
If you don't have an aerator, you need to change the water very other day at least--but take care not to stress the fish in doing this. The easiest solution is to get a proper aerator.
put the live fish in a bag filled with water and change the tank then put the fish back in.
That depends on the number and size of the fish you have added in the tank. But as blanket recommendation you can do 50 percent water change once in a week.
It is best that all fish have a filter besides Betta fish. Betta fish don't need filters cause the filter pushes them over with their big fins. Goldfish should have a filter on there tank because they are often overfed. If you have a filter you won't have to change the water as often. The only fish that shouldn't have a filer in captivity are Betta fish.
well if its cold water fish then 3-4 days :)..