I also tried to tune my skimmer since it’s been running for about a week but I think the tanks just too clean atm to really pull anything out!
That’s a good thing!
If you want to play with the skimmer a bit, you can try opening the air inlet control all the way, cranking up the power to the skimmer pump!
You don’t want the skimmer to constantly overflow into the cup, obviously… the large knob next to the cup is typically the skimmer’s internal water height adjustment…
I usually leave the skimmer internal water height adjustment wide open, air wide open, and pump turned up as high as it will go (assuming it doesn’t overflow the cup at 100%, even with height adjustment wide open)…
From here, you’re mixing as much water/air as is physically possible within your skimmer… not very efficiently, but that comes later!
— Now that skimmer pump, water height adjustment(drain), and air inlet are all wide open… Next step would be to slowly close the skimmer height adjustment (drain) knob! — this will make the water height/foam head inside the skimmer rise towards the collection cup…
Stop increasing skimmer water height when the foam head is at the base of the skimmer’s parallel-walled neck, and let it run there for a while to see what sort of foam head it starts producing/pushing up the neck on it’s own!
From here, numerous further adjustments can be made; this is just a proverbial quick start guide to get your skimmer pulling something out of the water!