I've never been a fan of Tunze skimmers (way underpowered IME & IMO). I much prefer oversized skimmers to undersized ones (unless you are willing and able to do very frequent water changes).
In my main display, I have been going against conventional wisdom and added a big Deltec skimmer without taking out my original Deltec skimmer. Together they pull out a lot of crap from the water column, but I feed frequently so the fish and corals don't suffer any negative effects from overskimming. I'm probably at three times the skimmer/water volume capacity.
Anthony