Oh yes. Perfectly normal. Carry on. When it smells like a dead animal is in your tank, or you just can't stand the floaters of residual film anymore, then it's time to drain and clean.
A little bleach (1 cup or so a week) will help the smell also. I drain and clean my tank once a week. During that time we go through about 120 meters of film and 2 gallons of activator, just as a reference.
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