I recently upgraded to a 40B from a 27 cube. All I'm running is an AquaClear 70 with chaeto and chemi pure elite and 2 koralia 1150's that will be arriving shorty. My livestock currently only consists of two clowns, a firefish, small CUC, and lots of zoa's and a few LPS. I currently do 10% water changes weekly. In a few months I would like to start doing biweekly water changes. My question is should I get a skimmer? If so, what are the ups and downs of one? What would be a good skimmer that can fit in my AquaClear? I'm aware that zoa's like the water a little "dirty", my plan is to have my coral livestock mainly consist of zoa's as they are by far my favorite.