Filtration Questions...Single Chamber Sump/Refugium HELP NEEDED

So I Have A 55 Gallon Tank And A 30 Gallon Tall Tank I Am Thinking About Using As A Refugium/Sump but I have some questions



1. Can My Refugium/Sump Have Only One Chamber.ive seen them with the baffles but wanted to know can I do it with out them.

2. Can The Sump Refugium House Fish?



3 What All Do I Need For A Sump Refugium



What I Have

Tank Bak Pak Protein Skimmer

100 Gallon Aqua Clear Filter

2 power heads

2 bublers

in tank filter I would like to take all of that out of my big tank and put them in the 30 gal