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the lower you let the collection cup sit the more it will skim. I dont let mine get to the top, i usually empty it when it gets halfway. usually in a weeks time.
also every tank is different... tank size,feeding habits, number of fish, LR, how often you do water changes are all factors that need to be looked at. So IMO you can not judge how effective Your skimmer is unless someone else has the same exact setup you have. You have been soing a lot of water changes lately right? So your output will be lower.. JMO