I had the same ??? and went ahead and removed the filter sock I had. Thgis is only my experiance as I am far from a pro, biologist.
I should also tell you my set up, this is important, I think.
I have a 125g mainly sps, fish include: fowlerii tang, orange shoulder tang, 2x clown, 3 damsels & 3 anthias. (fair bio load)
before my move and tank crash, my bio load was way more.
I run a asm g3 no mods. this works great, (I am also in the marcket for a better and more efficiant skimmer.
I am pushing in tank about 10k GPH Tunze, vortech (by far my fav.) & seio (5 x PH total 10k gph). 2 -250w MH.
I have my rock work now set up in the center of the tank, as opposed to the rock wall on the back of the glass. this was the opposite before the tank genocide.
Here is what I battled monthly for 9 months.
cyno some corals grew slow and color not sa good as when purchased.
So i skimmed wetter (is that a word?) I noticed a lot of particulate matter in the water column. Since I was setting up again I started and new maintenace plan. As money is tight. I do more water changes and now start to incorperate po4 media to minimize. also started to run carbon and added the sock back. The water is clear with minimal particulate matter floatting. SPS color way better and growth is back can see weekly changes.
I hope that this is not that fragmented and made sense.