Freshwater and Tropical Fish
I have a 55l Aquanano with neons, tetras, drawf gourami, and a cory catfish. This is an aqua-nano which has the equivalent of a 3-tier filter built in to the back utilizing: 1) 3-stage foam filter, 2) foam bio-block, 3) active charcoal, 4) 1kg of ceramic rings (in that order). The water...