Have been researching skimmers. setting up an all sps and clam tank teh skimmers I have cut down to are Aqua C, Euro Reef, MRC skimmer and thought about ETSS downdraft skimmer. total water volume will be around 120-130 gallons depending on sump size. have a remora HOB skimmer on tank now and know it works well. just want most efficent skimmer. chim in on your xperience with these skimmers . Thanks very much.