Here is a preview of my South American Blackwater Biotope aquarium. I worked on getting this tank setup for a month before adding fish. For several years this tank held a large black piranha and I've since traded him in and moved homes. I've always wanted to have a S/A black water aquarium with catfish, severums and silver dollars and tetras. I've been inspired by mongabay.com as well as other setups I've seen around the net. There WILL NOT be any plants to speak of in this tank. It just doesn't satisfy the Biotope. The main idea of this tank is to replicate a river bank snag close to the short side of a bend in the river or stream. I've produced a high amount of current to help satisfy that criteria. Any comments/suggestions please feel free to give your input. Stats: 120 gal A.G.A. 2x2x4 filtration: homemade sump 20L w/ bioballs magdrive 1200 HOB overflow hardscape: driftwood, rounded stones, sticks, almond leaves substrate: mix of multi purpose sand, playsand, and couple handfulls of mixed natural gravel projected fish stock: 5 spotted silver dollars 4 severums 7 BN plecos 1 L075 pleco 1 adonis pleco ( juvenile 3") 1 rhino pleco ( 6") 1 striped rapheal 1 spotted rapheal 1 megalodoras irwini 1 pseudodoras niger 1 hoplosternum thoracatum couple random others... Full tank shot Left hand side Right hand side p.s. I'll try and get some better pics up soon.