New 90 gallon mixed reef (eventually) tank about a week from adding water. I have a trigger 36 sump with 2 filter socks. I plan on running a reef octopus 150.00 and a refugium. After the refugium there is a small 2 layer compartment the top has a porous foam block. What should I put in the bottom compartment? When should I start the Refugium? What should I start it off with? I was thinking miracle mud, some rock rubble, and cheato. Is there a certain time this should be added? Will the copepods be able to make it past the foam filter section of my sump and up the returns?