It is a 10 gallon tank and it has been murky for about 3 days.
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First thing first, turn the tank light off. Do a 20% water change. Go to the pet store asap and get some product before the fish start dying. One of your fish or all could be infected.
You don't want to get rid of bacteria. You need it. If you're experiencing a bacteria bloom it's because either your tank hasn't cycled or you've done some major change that has set it off. The tank will clear on it's own when everything is in harmony again.
You should only do 10 to 15 % water changes weekly and rinse filter media in old tank water. If you add new fish it should be only one or 2 at a time so the balance isn't upset.
This is an excerpt re: white cloudy water, from Dr Helm's website. He also discusses green and yellow/brown water.
White Cloudy Water:
White cloudiness is usually the result of a bacteria bloom. Keep a careful check on ammonia levels, if the bacteria is a result on bacteria die off, you may experience increased ammonia levels and your tank maybe recycling. Bacteria also consume oxygen, so just as with an algae bloom, you want to increase circulation while treating the tank.
Medical treatment of your aquarium that has destroyed the bacteria colonies. (Not all medicines will destroy the bacteria but some will).
As in algae, high nutrient levels can also trigger a bacteria bloom (In this case, they are feeding on the excess nutrients)
Sometimes the cleaning of all filters at once, or the changing of the gravel can trigger a bacteria bloom, due to the removal of bacterial colonies that had settled on the filter media or substrate.
As with algae, you need to control the nutrient level of the tank. Once you control this, the bacteria bloom will usually go away on it's own.
If your tank is recycling and filled with expensive fish, you may want to consider the use of zeolites to absorb the ammonia while your tank finishes the cycle. This will extend the time that the tank needs to complete the cycle though.
Please dont buy any chemicals or products to get rid of the bacteria. You need it as part of the stage of cycling your tank. If you do something to clear up the water (which it will do on its own shortly) it will stop they cycle process and you will just have to go through it all overagain. So you might aswell weight it out.
When you say murky white murky or dark murky? White murky is a bacterial bloom which is caused due to your water quality is out of kilt. Either from newness, overfeeding, medications or PH is off. Test the water to see where your readings are this will give you a starting point.
When doing a water change change only 25% of the water no more no less. 10% will do nothing to help your tank.
If the color is darker or green it is an algae bloom caused by either overfeeding, over lighting high phosporous and or nitrate levels. Either way water change.
Adding phosporus pads will keep the algae at bay even over time. Watch how much you are feeding at one time. Do weekly water changes and test your water. Also, higher temps or sunlight from windows will also help this algae grow.