adult pencilfish enjoy life in nature biotope aquarium, dim light with brown tannin stained water

acidic adult amazonia amazonian america animal aqua aquarium aquascape aquatic background beckfordi biotope blackwater blurred brazilian bright brown captive careful characin colourful commercial conditions controlled copy decorative design detail dim ecology endemic enjoy exotic fauna fish fishkeeping free freshwater golden habitat happy hard hobby instinct keep lebiasinidae life light low nannostomus natural nature negro ornamental pencil pencilfish piaba project protection rio south space stained stripe tank tannin understanding underwater vulnerable water yellow