I have 4 tanks. I change my water weekly most of the time, and sometimes every other week. I change 20-40% of the water and perform gravel vacs with each change. Nitrates tend to stay below 10 in all tanks. I do not always take out the decorations, but I do on occasion in all but my 100 gallon tank. That one will just have to build up due to the heavy rock work. I try to make sure the sinking food stays at the front where the gravel is to minimize any problems the inability to get behind the rocks may cause.
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