The water in my freshwater tank is cloudy and there is a lot of foam around the edges of the tank. How can I fix this?
by 
Kenneth Marx
ANSWERS: 2
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The water seems to have a very high phosphate and/or organic content. This usually happens when you do not do regularly change the water in the tank or when you fill the tank with water from a less than pure source. To remedy the situation, tank the fish out of the tank, drain the water, rinse the substrate and put it all back together with fresh clean water.
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Hello; This is a common problem and usually is the result of old water high in disolved organic compounds and a bacteria colony that is too small. I have tried a lot of filters --- bio-wheels --- canister --- Fluval --- and non can compare with an undergravel filter with 2-to-4 inches of medium gravel. This large gravel bed not only captures the waste and excess food but grows a HUGE biological bacteria colony. I never have cloudy water and only clean my gravel bed once a month by siphon vacuuming. Easy to clean and lasts a lifetime. An undergravel filter grows aerobic bacteria where water flows and anaerobic bacteria where little or no water flows so it reduces the nitrate levels also. It will not take the nitrate levels to zero, but adding a lot of live plants will keep the nitrate levels at 10-ppm or below between water changes. OFM
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