Personally, I would get the pump in farther, no need to skim surface... Over time, the cleaner the water, no skum on surface and also as long as you agitate the surface of the water it also helps to remove from surface and then particles in water column can be sucked up or they settle.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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