tubenose goby, timid, active gobiidae, dwarf saltwater species spread fins, open mouth with barbels and show off

active adult algae animal aquaculture aquarium aquascape aquatic barbels behaviour biodiversity biotic biotope black bottom brackish brown captive clear coldwater conditions controlled decorative design discovery dof dwarf ecology endemic environment european exotic fauna fins fish fishkeeping free glass gobiidae goby gravel ichthyology instinct life look macro marine marmoratus mouth natural nature open organism protection proterorhinus reef saltwater salty sea shallow show space species spotted spread tank temperate timid tubenose ulva underwater vegetation vulnerable water wild