monkey goby, funny juvenile freshwater fish from southern bug river, rest on cladophora bus in biotope aquarium

adaptable animal aqua aquadesign aquarium aquatic biotic biotope brackish bug bus cladophora clear closeup deathly decorative destructive ecology endemic exotic fauna favourite fish fishkeeping fluviatilis freshwater funny gobiidae goby gravel harmful highly invasive juvenile lips local monkey mouth nano native natural nature neogobius pet pontocaspian predator rare rest river sand southern species swim tank threat underwater unusual water weed widespread wild wildlife young