My stippled clingfish (Gobiesox punctulatus) is by far the most personable fish I own. It normally assumes a drab, muddy-brown coloration and hides behind my overflow, staying completely still. However, when it notices me, it darts out, flares its white facial markings, and starts wagging its tail like a dog to grab my attention. During feeding time, it will attach itself to my hand and take pellets, frozen food, live food... basically anything I throw at it that isn't flake food and allow me to pet its back. It will even cling to my hands during tank maintenance when my other fish normally dart into my rockwork and macroalgae to hide from me. This complete lack of caution made it very easy for me to simply pluck it out of my quarantine tank (as seen in the pictures below) in preparation for acclimation to my main tank: