01-07-2010, 08:44 PM
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it depends on the filtration system and your tank size
too much water change can affect biological filter, and may destroy good bacteria colony, and filters should never be thoroughly cleaned, for the bacteria will have to re-colonize. and can have some dramatic changes to your fish.
i have 220 gallon, and i do water change once few month, because i use sump system, and my sump is 80 gallon so together is 300 gallon of water. but i do change first level filter matt bi-weekly
from the amount of fish you have there in your signature, i would suggest you to have...
15% water change per week
40% - 50% water change per month depended on your monthly food consumption.