Nice sump n filtration system bro..the best filtration system I see n read about so far is only LR n cheato..no skimmer..no chiller..no fan..wonder how it work till so good..I will definitely go find out more about ATM outbreak system..
Filter sock I find is just a ease of mind filter..the sock will b brown n dirty no matter how clean the tank water is by placing the sock in the last compartment of the sump..being brown n dirty mean the water was filtered n become clean..
Happy reefing..