monkey goby, funny juvenile freshwater fish, looks attentively in southern bug river biotope aquarium, highly adaptable

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