Thanks a lot ill keep it running then and see how it works outI believe you should run your skimmer while your tan cycles. That way the skimmer can break in while the tank goes through the cycle. Once the cycle is complete your skimmer will be ready to go and you will be familiar with the adjustments and operation of the skimmer. I have had the same issue and it can be either to low of a bio load or to big of a skimmer.
Its an ocean free skimmer came with the 24L tank, water is just above the minimum line on tank.What skimmer are you running, and at what depth?