Water Change?

As a general rule, 10% change per week is fine. However, if you have a large bio-load, larger water changes may be in order.
 
bio-load is fish waste or anything left over from feedings.... i.e. more animals = more waste + more feedings = higher bio-load
 
I would do a 2 gallon change every week with a higher bioload. Maybe after the tank has matured a bit you can do 1 gallon a week. Or 2 gallons every other week.
 
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