I won't stick my neck out and try to name a "best", but I wouldn't even call Coralife skimmers average. Lots of companies make very good skimmers (MRC, Bubble King, Vertex, Super Reef Octopus) but which one you choose will be based on preference. For example, BK skimmers are great if you have deep pockets. MRCs work VERY well, but have to have the injectors cleaned regularly and do their best work with powerful external pumps. I don't consider that a negative, but rather what it takes to have the performance. In some peoples' opinion (whom I respect very much) NOTHING skims as well a Beckett injection skimmer like the MRC. The downside? Not quiet with the proper pump, and you clean the Becketts from time to time (which is not hard).