fish are starting to die after partial water change

Question
i have a community tank 55 gallons and have danios, platays
neons and after 2 partial water changes because my tank became cloudy my fish are starting to die ..please help

Answer
Dear Talisa,
Sorry that is happening. First, has your tank been set up very long and has it cycled? Sometimes, if a tank hasn't been set up very long it has not cycled and there is an ammonia or nitrite spike and that causes the fish to die. Also, sometimes if a tank has just been set up it will go through a stage of cycling and the water will get cloudy.  
If this is an established tank have you been doing water changes and gravel vacuuming regularly? If not, and it has been a while then the ph will drop and then when you do a water change the water you replace causes the ph to go up and that is a shock to the fish and that can cause them to die.  Make sure when you do a water change that you are adding a really good water conditioner that helps eliminate ammonia, nitrites and nitrates along with also removing chlorine and chloramine.  Make sure the replacement water temperature is the same as the tank water.
It is better to do frequent water changes and gravel vacuuming regularly to help control the waste that the fish produce and also any left over food that might be decaying will be removed.
These are just some of the possibilites that might be causing your fish death. I know when a tank gets cloudy water that it is very frustrating. You just have to be patient with it and try to remove a portion of the water regulary until things get back to normal.  Sometimes, you might want to add extra bacteria to help with any fish waste.  I have used a brand called"Cycle" and that helps to get the tank  more balanced again.  You might want to test your water with a test kit to see if there is ammonia, nitrites or nitrates that are not in the safe zone for your fish. Best of luck with your tank.
Hope this helps.
Karen