I stopped using my socks as well. Might be my imagination but my polyp extension seems to be better since removing them.
The downside is more particulate matter in the water column and throughout the sump. I imagine the skimmer gets more stuff to take out and there's less rotting in the sock. My nutrients may have gone down some I'm not sure but I do know the liverock compartment of my sump (where I do waterchanges from as well) has a lot more crap settling in it now. I can't easily access this area to suction it out so I may remove this rock from the system. Food for thought maybe...
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