A new, first of it's kind aquarium additive named re:skim improves the function of small protein skimmers. Sometimes referred to as "Nano , HOB (Hang On Back) or HOT (Hang On Tank) Skimmers ", these protein skimmers are notorious for poor performance. The product re:skim improves the performance of these small skimmers so well that upgrading skimmers is no longer necessary. Get the water quality that you never thought possible before , while saving hundreds to upgrade your equipment.