If there is ever a reading above zero for ammonia or nitrite, do a water change.
If ammonia and nitrite stay at zero, you need to do weekly 50% or more water changes.
Weekly water changes are to remove all sorts of things from the tank, from waste products we can't test for to micro-organisms which can cause disease, and to replenish minerals which are used up during the week. We do weekly water changes even if the water conditions don't change.
If ammonia and nitrite stay at zero, you need to do weekly 50% or more water changes.
Weekly water changes are to remove all sorts of things from the tank, from waste products we can't test for to micro-organisms which can cause disease, and to replenish minerals which are used up during the week. We do weekly water changes even if the water conditions don't change.