I find that it helps to storm the tank every couple of weeks or so. For small tanks you just put your hand in and gently make some current to get some of the debris off of your rock. A small submersible pump with some filter floss on the intake strainer afterwards removes an amazing amount of gunk. I find that this also helps your coraline algae to spread as it is not choked out by the fine silt that acumulates on your rocks.
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