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Overfeeding, and not chaning the water enough. That fog is a combination of phosphates and ammonia, which comes from decomposing wasted food and fish waste. You should change about 20% of the water once a week, and make sure to remove any uneaten food from the tank. When you change the water, you should age it for 24 hours to evaporate chloramines, you should also use a water conditioner.
If it is fogging up quickly, such as every couple of days, change the gravel or use a gravel vac, there may be waste trapped in the rocks.
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