 Nano Protein Skimmers are a great way to keep the quality of your small marine aquariums water quality high. Although these units are fairly new we have found that they provide a great deal of benefits. Nano Protein Skimmers provide all the same skimming techniques as their larger counterparts simply by shrinking the parts.
These units are not a basic air stone but are proper water pump driven skimmers which draw in the water and either create the correct bubble size with a pin wheel or venturi.
If you have a small tank I would highly recoomend one of these! | 
