02-09-2011, 12:41 AM
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that depends entirely on the nutrient uptake in the tank and the nutrient input, so this is not an easy question to answer. Even if your tank is fine running filterless, you still need some form of water movement. I could list a number of reasons why you need water movement, but one of the things water movement does that nothing else can is evenly heat the tank. I beleive it is possible to run a stagnant tank, but I doubt your tank is in a warm enough environment and it is quite risky with the stock you have. Running without a filter is certainly possible with planted tanks, but you must be very careful when doing this. I run one filterless tank and another tank is only filtered when I am awake.