Not necessarily - if you completely remove all the water, you could lose most of your beneficial bacteria that helped to establish your tank when it cycled. If your fish died from something parasitic, then yes, you need to clean absolutely everything. If it died due to a water quality issue, then no.
First thing I would recommend would be a water test, primarily PH, Salinity (if salt or brackish), ammonia, nitrite, nitrate. Fish death does produce ammonia but your bacterial load should compensate for it unless a newer tank. If these where your first fish in a new tank then no, do not do a water change. If an established tank then if your water test shows any issues then a water change may be needed.
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.
It depends on the type of fish.Some fishes are sensitive to water but if it's a regular fish you would change it about 1-2 times a week
yes but it would need a heater as they are both tropical fish and you would need to change the water alot.
All fish need at least a 50% water change weekly. Good practice is to change 10% daily and 50% weekly. It is assumed that the tank is large enough for the fish (1 inch of fish needs a minimum of 1 gallon of water) and filtered properly too.
The commonest reason for fish to die as you described is bad water conditions. There is a basic rule that most pet shops choose to ignore. That rule is "1 inch of fish needs a minimum of 1 gallon of water". That means that the minimum size tank a Betta should be kept in is a 3 gallon tank. Then they would need a weekly water change of at least 50%.
No. This is overcrowded and you change the water every day? That will stress the fish out and the constant change of chemicals and temperature can harm the fish. Please do not continue this. When a few die do not get more. I suggest change the water once every 1-2 weeks. Whatever you do, do not continue this.You should consider getting at least a 20 gallon tank, or re-homing some of the fish to avoid overcrowding your fish.
The calculation is 1 inch of fish needs a minimum of 1 gallon of water. Also necessary are a cycled filter running permanently and a 50% water change every week. The fish is tropical so it will also need a heater/thermostat and a thermometer.
It is either dead or dying. The thing that is killing it is bad water conditions. My advice is to do a water change ASAP. Then stick to the basic rules for keeping fish alive :- 1 inch of fish needs a minimum of 1 gallon of water, a cycled filter constantly running and at least 50% water changed every week.
This is a common problem and is usually caused by a poor set of living conditions. If the fish is not in sufficient water. "1 inch of fish needs a minimum of 1 gallon of water" and if the tank is not getting sufficient water changes. (50% weekly at least) I would advise you to correct its living conditions first. To cure the fish add 1 level teaspoon of Magnesium sulphate (MgSO4) to 2 gallons of water in the tank. This treatment can stay in the tank for 6 days until the weekly water change and then it will be steadily reduced each water change. Consider feeding the fish some live food occasionally as well as its normal flake or pellets.
Your fish can be put straight back in the tank after using dechlorinator, as long as you have not performed a whole water change. A 30% water change every 2 weeks is recommended, and putting your fish back in the tank straight after this change of dechlorinated water shouldn't do them any harm, just as it hasn't done any harm to my 3 healthy barbs (1 rosy, 2 odessas.
There would only be one fish left: 2-1=1.
Fish Police - 1992 A Fish Out of Water 1-2 was released on: USA: 6 March 1992