how often should i clean my gravel in my 55 gal cichlid tank? i am just asking bc i have a lot of rock work in it and i don't want to have to break it all down no more than i have too. i have 5 fish in there for the time being (they are about 2 to 3 inches in size). and how often should i clean the gravel when i have about 10 to 12 fish in the tank. i wont be adding other fish for a couple of weeks. until xmas blows over.