Here's my input on eshopps skimmers .
I have the nano on my 29gallon . Took me a month to get it working and dialed in then a couple more months to get it to really skimming good.
. First , Is the pump adjustable? This will let you adjust the flow going in to the bubble chamber.
Second , is the height on the skimmer adjustable? this will let you fine tune the top of the water level in the chamber .
Third I recommend getting a small inline adjustment valve to go in your airline. This will let you fine tune your air to water mixture and get the fine mist you want .
Also new skimmers are just that ,new. They need break in time . They need to build up a coating of nasty inside . This keeps the bubbles from just popping when the hit the plastic and let's the skimming action work .
Let's see if we can get ya going